diff --git a/src/main/java/com/googlesource/gerrit/plugins/task/TaskTree.java b/src/main/java/com/googlesource/gerrit/plugins/task/TaskTree.java
index cdc0c50..f2e651e 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/task/TaskTree.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/task/TaskTree.java
@@ -450,7 +450,7 @@
             return;
           }
         } catch (StorageException e) {
-          log.atSevere().withCause(e).log("ERROR: running changes query: " + namesFactory.changes);
+          log.atSevere().withCause(e).log("ERROR: running changes query: %s", namesFactory.changes);
         } catch (QueryParseException | ConfigInvalidException e) {
         }
         addInvalidNode();