diff --git a/releng.wtpbuilder/distribution/wtp.tests/build.xml b/releng.wtpbuilder/distribution/wtp.tests/build.xml
index 274231d..a5653aa 100644
--- a/releng.wtpbuilder/distribution/wtp.tests/build.xml
+++ b/releng.wtpbuilder/distribution/wtp.tests/build.xml
@@ -154,6 +154,7 @@
 				</fileset>		
 			</resourcecount>
 		</condition>
+		<fail message="Did not find expected number of launcher jars. Check installation." unless="expectedNumberOfLaunchers" />
 		<java 
 		    taskname="unit-test-masterprocess" 
 		    fork="true"
diff --git a/releng.wtpbuilder/distribution/wtp.tests/testScripts/wtp-junit-tests.xml b/releng.wtpbuilder/distribution/wtp.tests/testScripts/wtp-junit-tests.xml
index dad6e47..d5eecb2 100644
--- a/releng.wtpbuilder/distribution/wtp.tests/testScripts/wtp-junit-tests.xml
+++ b/releng.wtpbuilder/distribution/wtp.tests/testScripts/wtp-junit-tests.xml
@@ -92,6 +92,7 @@
 				</fileset>		
 			</resourcecount>
 		</condition>
+		<fail message="Did not find expected number of launcher jars. Check installation." unless="expectedNumberOfLaunchers" />
 		<java 
 		taskname="suiteUnitTest" 
 		fork="true"