diff --git a/src/com/facebook/buck/shell/Genrule.java b/src/com/facebook/buck/shell/Genrule.java
index becc2de..5f6192b 100644
--- a/src/com/facebook/buck/shell/Genrule.java
+++ b/src/com/facebook/buck/shell/Genrule.java
@@ -237,7 +237,7 @@
 
     // Create a shell command that corresponds to this.cmd.
     final String cmd = replaceBinaryBuildRuleRefsInCmd();
-    final ImmutableList<String> commandArgs = ImmutableList.of("/bin/bash", "-c", cmd);
+    final ImmutableList<String> commandArgs = ImmutableList.of("/bin/bash", "-ec", cmd);
     ImmutableMap.Builder<String, String> environmentVariablesBuilder = ImmutableMap.builder();
 
     addEnvironmentVariables(environmentVariablesBuilder);