diff --git a/win32/build/confutils.js b/win32/build/confutils.js
index 8dc6a5004ce..451954406fa 100644
--- a/win32/build/confutils.js
+++ b/win32/build/confutils.js
@@ -2347,7 +2347,7 @@ function generate_makefile()
 		}
 	}
 	MF.WriteLine("set-test-env:");
-	MF.WriteLine("	@set PATH=" + extra_path + ";%PATH%");
+	MF.WriteLine("	@set PATH=" + extra_path + ";$(PATH)");
 
 	MF.WriteBlankLines(2);