diff --git a/modules/cfe_testcase/src/es_application_control_test.c b/modules/cfe_testcase/src/es_application_control_test.c
index efe211f18..ced29105c 100644
--- a/modules/cfe_testcase/src/es_application_control_test.c
+++ b/modules/cfe_testcase/src/es_application_control_test.c
@@ -45,7 +45,7 @@ void TestApplicationControl(void)
      * error is ignored in CFE_ES_ReloadApp and file io error is returned
      * most other functions return a CFE_ES_BAD_ARGUMENT in this situation
      */
-    UtAssert_UINT32_EQ(CFE_ES_ReloadApp(TestAppId, NULL), CFE_ES_FILE_IO_ERR);
+    UtAssert_UINT32_EQ(CFE_ES_ReloadApp(TestAppId, ""), CFE_ES_FILE_IO_ERR);
     UtAssert_UINT32_EQ(CFE_ES_ReloadApp(TestAppId, "/cf/NOT_cfe_testcase.so"), CFE_ES_FILE_IO_ERR);
     UtAssert_UINT32_EQ(CFE_ES_ReloadApp(CFE_ES_APPID_UNDEFINED, "/cf/cfe_testcase.so"),
                        CFE_ES_ERR_RESOURCEID_NOT_VALID);