diff --git a/Makefile b/Makefile
index b18ae34..d5fde9f 100644
--- a/Makefile
+++ b/Makefile
@@ -32,7 +32,7 @@ integration:
 	cargo run -- test -r integration_tests
 
 stdlibtest:
-	cargo run -- test -r std/tests
+	cargo run -- test -r std$(pathchar)tests
 
 install: test
 	cargo install --path . --force