diff --git a/build/org.eclipse.cdt.managedbuilder.core.tests/tests/org/eclipse/cdt/managedbuilder/language/settings/providers/tests/BuiltinSpecsDetectorTest.java b/build/org.eclipse.cdt.managedbuilder.core.tests/tests/org/eclipse/cdt/managedbuilder/language/settings/providers/tests/BuiltinSpecsDetectorTest.java
index 7e643eb814b..c59788f7cf0 100644
--- a/build/org.eclipse.cdt.managedbuilder.core.tests/tests/org/eclipse/cdt/managedbuilder/language/settings/providers/tests/BuiltinSpecsDetectorTest.java
+++ b/build/org.eclipse.cdt.managedbuilder.core.tests/tests/org/eclipse/cdt/managedbuilder/language/settings/providers/tests/BuiltinSpecsDetectorTest.java
@@ -851,6 +851,10 @@ public class BuiltinSpecsDetectorTest extends BaseTestCase {
 		assertEquals(true, provider.isExecuted());
 		assertEquals(ENV_SAMPLE_VALUE_2, provider.getSampleEnvVar());
 
+		// clean up
+		vars.deleteAll();
+		fUserSupplier.setWorkspaceEnvironment(vars);
+
 		// unregister listeners
 		provider.unregisterListener();
 	}