diff --git a/regression_test/portTranslation/Makefile b/regression_test/portTranslation/Makefile
index 04648ba33a95467adba2179379d8524327a7c6e5..2e832903ba7a2b97403099e05cb420c9492ca2e4 100644
--- a/regression_test/portTranslation/Makefile
+++ b/regression_test/portTranslation/Makefile
@@ -135,4 +135,4 @@ endif
 # Add your rules here if necessary...
 #
 run: $(TARGET) config.cfg
-	ttcn3_start $^
+	$(TTCN3_DIR)/bin/ttcn3_start $^