diff --git a/src/test/java/com/google/devtools/build/lib/packages/util/MockCcSupport.java b/src/test/java/com/google/devtools/build/lib/packages/util/MockCcSupport.java
index c0e6f48..fb90fc7 100644
--- a/src/test/java/com/google/devtools/build/lib/packages/util/MockCcSupport.java
+++ b/src/test/java/com/google/devtools/build/lib/packages/util/MockCcSupport.java
@@ -695,7 +695,7 @@
           PathFragment.create(TestConstants.MOCK_CC_CROSSTOOL_PATH));
     } catch (LabelSyntaxException e) {
       Verify.verify(false);
-      throw new AssertionError();
+      throw new AssertionError(e);
     }
   }