diff --git a/gerrit-httpd/src/main/java/com/google/gerrit/httpd/rpc/SuggestServiceImpl.java b/gerrit-httpd/src/main/java/com/google/gerrit/httpd/rpc/SuggestServiceImpl.java
index 559c270..22546a7 100644
--- a/gerrit-httpd/src/main/java/com/google/gerrit/httpd/rpc/SuggestServiceImpl.java
+++ b/gerrit-httpd/src/main/java/com/google/gerrit/httpd/rpc/SuggestServiceImpl.java
@@ -201,8 +201,9 @@
 
   private List<GroupReference> suggestAccountGroup(
       @Nullable final ProjectControl projectControl, final String query, final int limit) {
-    final int n = limit <= 0 ? 10 : Math.min(limit, 10);
-    return Lists.newArrayList(Iterables.limit(groupBackend.suggest(query), n));
+    return Lists.newArrayList(Iterables.limit(
+        groupBackend.suggest(query, projectControl),
+        limit <= 0 ? 10 : Math.min(limit, 10)));
   }
 
   @Override
diff --git a/gerrit-server/src/main/java/com/google/gerrit/server/account/GroupBackend.java b/gerrit-server/src/main/java/com/google/gerrit/server/account/GroupBackend.java
index b4e770f..34db967 100644
--- a/gerrit-server/src/main/java/com/google/gerrit/server/account/GroupBackend.java
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/account/GroupBackend.java
@@ -19,6 +19,7 @@
 import com.google.gerrit.extensions.annotations.ExtensionPoint;
 import com.google.gerrit.reviewdb.client.AccountGroup;
 import com.google.gerrit.server.IdentifiedUser;
+import com.google.gerrit.server.project.ProjectControl;
 
 import java.util.Collection;
 
@@ -44,7 +45,9 @@
   GroupDescription.Basic get(AccountGroup.UUID uuid);
 
   /** @return suggestions for the group name sorted by name. */
-  Collection<GroupReference> suggest(String name);
+  Collection<GroupReference> suggest(
+      String name,
+      @Nullable ProjectControl project);
 
   /** @return the group membership checker for the backend. */
   GroupMembership membershipsOf(IdentifiedUser user);
diff --git a/gerrit-server/src/main/java/com/google/gerrit/server/account/GroupBackends.java b/gerrit-server/src/main/java/com/google/gerrit/server/account/GroupBackends.java
index cdbb0e4..f7e0634 100644
--- a/gerrit-server/src/main/java/com/google/gerrit/server/account/GroupBackends.java
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/account/GroupBackends.java
@@ -16,6 +16,8 @@
 
 import com.google.common.collect.Iterables;
 import com.google.gerrit.common.data.GroupReference;
+import com.google.gerrit.reviewdb.client.Project;
+import com.google.gerrit.server.project.ProjectControl;
 
 import java.util.Collection;
 import java.util.Comparator;
@@ -36,7 +38,7 @@
   };
 
   /**
-   * Runs {@link GroupBackend#suggest(String)} and filters the result to return
+   * Runs {@link GroupBackend#suggest(String, Project)} and filters the result to return
    * the best suggestion, or null if one does not exist.
    *
    * @param groupBackend the group backend
@@ -44,9 +46,23 @@
    * @return the best single GroupReference suggestion
    */
   @Nullable
-  public static GroupReference findBestSuggestion(
-      GroupBackend groupBackend, String name) {
-    Collection<GroupReference> refs = groupBackend.suggest(name);
+  public static GroupReference findBestSuggestion(GroupBackend groupBackend,
+      String name) {
+    return findBestSuggestion(groupBackend, name, null);
+  }
+  /**
+   * Runs {@link GroupBackend#suggest(String, Project)} and filters the result to return
+   * the best suggestion, or null if one does not exist.
+   *
+   * @param groupBackend the group backend
+   * @param name the name for which to suggest groups
+   * @param project the project for which to suggest groups
+   * @return the best single GroupReference suggestion
+   */
+  @Nullable
+  public static GroupReference findBestSuggestion(GroupBackend groupBackend,
+      String name, @Nullable ProjectControl project) {
+    Collection<GroupReference> refs = groupBackend.suggest(name, project);
     if (refs.size() == 1) {
       return Iterables.getOnlyElement(refs);
     }
@@ -60,7 +76,7 @@
   }
 
   /**
-   * Runs {@link GroupBackend#suggest(String)} and filters the result to return
+   * Runs {@link GroupBackend#suggest(String, Project)} and filters the result to return
    * the exact suggestion, or null if one does not exist.
    *
    * @param groupBackend the group backend
@@ -70,7 +86,22 @@
   @Nullable
   public static GroupReference findExactSuggestion(
       GroupBackend groupBackend, String name) {
-    Collection<GroupReference> refs = groupBackend.suggest(name);
+    return findExactSuggestion(groupBackend, name, null);
+  }
+
+  /**
+   * Runs {@link GroupBackend#suggest(String, Project)} and filters the result to return
+   * the exact suggestion, or null if one does not exist.
+   *
+   * @param groupBackend the group backend
+   * @param name the name for which to suggest groups
+   * @param project the project for which to suggest groups
+   * @return the exact single GroupReference suggestion
+   */
+  @Nullable
+  public static GroupReference findExactSuggestion(
+      GroupBackend groupBackend, String name, ProjectControl project) {
+    Collection<GroupReference> refs = groupBackend.suggest(name, project);
     for (GroupReference ref : refs) {
       if (isExactSuggestion(ref, name)) {
         return ref;
diff --git a/gerrit-server/src/main/java/com/google/gerrit/server/account/InternalGroupBackend.java b/gerrit-server/src/main/java/com/google/gerrit/server/account/InternalGroupBackend.java
index d06db4d..a70f942 100644
--- a/gerrit-server/src/main/java/com/google/gerrit/server/account/InternalGroupBackend.java
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/account/InternalGroupBackend.java
@@ -23,6 +23,7 @@
 import com.google.gerrit.common.data.GroupReference;
 import com.google.gerrit.reviewdb.client.AccountGroup;
 import com.google.gerrit.server.IdentifiedUser;
+import com.google.gerrit.server.project.ProjectControl;
 import com.google.inject.Inject;
 import com.google.inject.Singleton;
 
@@ -71,7 +72,8 @@
   }
 
   @Override
-  public Collection<GroupReference> suggest(final String name) {
+  public Collection<GroupReference> suggest(final String name,
+      final ProjectControl project) {
     Iterable<AccountGroup> filtered = Iterables.filter(groupCache.all(),
         new Predicate<AccountGroup>() {
           @Override
diff --git a/gerrit-server/src/main/java/com/google/gerrit/server/account/UniversalGroupBackend.java b/gerrit-server/src/main/java/com/google/gerrit/server/account/UniversalGroupBackend.java
index d9c9257..046dfa5 100644
--- a/gerrit-server/src/main/java/com/google/gerrit/server/account/UniversalGroupBackend.java
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/account/UniversalGroupBackend.java
@@ -26,6 +26,7 @@
 import com.google.gerrit.extensions.registration.DynamicSet;
 import com.google.gerrit.reviewdb.client.AccountGroup;
 import com.google.gerrit.server.IdentifiedUser;
+import com.google.gerrit.server.project.ProjectControl;
 import com.google.inject.Inject;
 import com.google.inject.Singleton;
 
@@ -82,10 +83,10 @@
   }
 
   @Override
-  public Collection<GroupReference> suggest(String name) {
+  public Collection<GroupReference> suggest(String name, ProjectControl project) {
     Set<GroupReference> groups = Sets.newTreeSet(GROUP_REF_NAME_COMPARATOR);
     for (GroupBackend g : backends) {
-      groups.addAll(g.suggest(name));
+      groups.addAll(g.suggest(name, project));
     }
     return groups;
   }
diff --git a/gerrit-server/src/main/java/com/google/gerrit/server/auth/ldap/LdapGroupBackend.java b/gerrit-server/src/main/java/com/google/gerrit/server/auth/ldap/LdapGroupBackend.java
index 2cf372b..97a0309 100644
--- a/gerrit-server/src/main/java/com/google/gerrit/server/auth/ldap/LdapGroupBackend.java
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/auth/ldap/LdapGroupBackend.java
@@ -33,6 +33,7 @@
 import com.google.gerrit.server.account.ListGroupMembership;
 import com.google.gerrit.server.auth.ldap.Helper.LdapSchema;
 import com.google.gerrit.server.project.ProjectCache;
+import com.google.gerrit.server.project.ProjectControl;
 import com.google.inject.Inject;
 import com.google.inject.Provider;
 import com.google.inject.name.Named;
@@ -164,7 +165,7 @@
   }
 
   @Override
-  public Collection<GroupReference> suggest(String name) {
+  public Collection<GroupReference> suggest(String name, ProjectControl project) {
     AccountGroup.UUID uuid = new AccountGroup.UUID(name);
     if (isLdapUUID(uuid)) {
       GroupDescription.Basic g = get(uuid);
diff --git a/gerrit-server/src/main/java/com/google/gerrit/server/query/change/ChangeQueryBuilder.java b/gerrit-server/src/main/java/com/google/gerrit/server/query/change/ChangeQueryBuilder.java
index 7bbb073..e74172e 100644
--- a/gerrit-server/src/main/java/com/google/gerrit/server/query/change/ChangeQueryBuilder.java
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/query/change/ChangeQueryBuilder.java
@@ -367,7 +367,7 @@
 
     // If its not an account, maybe its a group?
     //
-    Collection<GroupReference> suggestions = args.groupBackend.suggest(who);
+    Collection<GroupReference> suggestions = args.groupBackend.suggest(who, null);
     if (!suggestions.isEmpty()) {
       HashSet<AccountGroup.UUID> ids = new HashSet<AccountGroup.UUID>();
       for (GroupReference ref : suggestions) {