diff --git a/com.ibm.wala.core.tests/build.xml b/com.ibm.wala.core.tests/build.xml
index d46ae7f13..8cbabbd6c 100644
--- a/com.ibm.wala.core.tests/build.xml
+++ b/com.ibm.wala.core.tests/build.xml
@@ -7,7 +7,7 @@
 	<property name="basenl" value="${nl}"/>
 
 	<!-- Compiler settings. -->
-	<property name="javacFailOnError" value="false"/>
+	<property name="javacFailOnError" value="true"/>
 	<property name="javacDebugInfo" value="on"/>
 	<property name="javacVerbose" value="false"/>
 	<property name="logExtension" value=".log"/>