diff --git a/BaseTools/Tests/GNUmakefile b/BaseTools/Tests/GNUmakefile
index af334a8ac2..b920044ae1 100644
--- a/BaseTools/Tests/GNUmakefile
+++ b/BaseTools/Tests/GNUmakefile
@@ -14,7 +14,7 @@
 all: test
 
 test:
-	@if command -v $(PYTHON3) >/dev/null 2>&1; then $(PYTHON3) RunTests.py; else python RunTests.py; fi
+	@if command -v python3 >/dev/null 2>&1; then python3 RunTests.py; else echo "Error: Please install a python 3 tool!"; fi
 
 clean:
 	find . -name '*.pyc' -exec rm '{}' ';'