diff --git a/testApp/rtemsTestHarness.c b/testApp/rtemsTestHarness.c
index 18a9120..1782eb8 100644
--- a/testApp/rtemsTestHarness.c
+++ b/testApp/rtemsTestHarness.c
@@ -3,6 +3,9 @@
  * found in the file LICENSE that is included with the distribution
  */
 
+/* no data files needed */
+char* epicsRtemsFSImage = 0;
+
 extern void pvAccessAllTests(void);
 
 int main(int argc, char **argv)