diff --git a/pykat/testing/test.py b/pykat/testing/test.py
index 9d1b76e21019b3568af2164d824ea89dcb205a59..fc08b8ac81cdc70d462e498f6de08fe8ad2e0fdf 100644
--- a/pykat/testing/test.py
+++ b/pykat/testing/test.py
@@ -174,7 +174,7 @@ class FinesseTestProcess(Thread):
         if not os.path.exists(FINESSE_EXE):
             raise Exception("Kat file was not found in " + FINESSE_EXE)
         
-        if os.access(FINESSE_EXE, os.X_OK)):
+        if not os.access(FINESSE_EXE, os.X_OK)):
             raise Exception("Kat file was not executable, could need higher privileges")
         
         out = None