diff --git a/org.jacoco.agent.rt.test/src/org/jacoco/agent/rt/internal/CoverageTransformerTest.java b/org.jacoco.agent.rt.test/src/org/jacoco/agent/rt/internal/CoverageTransformerTest.java
index 7dc67b1c14..194ac206cc 100644
--- a/org.jacoco.agent.rt.test/src/org/jacoco/agent/rt/internal/CoverageTransformerTest.java
+++ b/org.jacoco.agent.rt.test/src/org/jacoco/agent/rt/internal/CoverageTransformerTest.java
@@ -214,8 +214,10 @@ public void testTransformFailure() {
 					protectionDomain, null);
 			fail("IllegalClassFormatException expected.");
 		} catch (IllegalClassFormatException e) {
-			assertTrue(e.getMessage(), e.getMessage()
-					.startsWith("Error while instrumenting org.jacoco.Sample"));
+			assertEquals(String.format(
+					"Error while instrumenting %s with JaCoCo %s/%s.",
+					"org.jacoco.Sample", JaCoCo.VERSION, JaCoCo.COMMITID_SHORT),
+					e.getMessage());
 		}
 		recorder.assertException(IllegalClassFormatException.class,
 				String.format("Error while instrumenting %s with JaCoCo %s/%s.",