diff --git a/Makefile b/Makefile
index 3c776d5..ce192ac 100644
--- a/Makefile
+++ b/Makefile
@@ -27,7 +27,7 @@ endif
 
 musllib: $(SYSROOT)/usr/lib/libc.a
 $(SYSROOT)/usr/lib/libc.a:
-	toolchain/build-musl.sh
+	${BUILDROOT}/toolchain/build-musl.sh
 
 libmittos: $(SYSROOT)/usr/lib/libmittos.a
 $(SYSROOT)/usr/lib/libmittos.a: FORCE