--- a/run_rustc/Makefile
+++ b/run_rustc/Makefile
@@ -103,7 +103,9 @@
 else
 	cp $(OUTDIR)build-rustc/release/rustc_binary $(BINDIR)rustc_binary
 endif
-	echo '#!/bin/sh\nd=$$(dirname $$0)\nLD_LIBRARY_PATH="$(abspath $(LIBDIR))" $$d/rustc_binary $$@' >$@
+	echo '#!$(shell which bash)' > $@
+	echo 'd=$$(dirname $$0)' >> $@
+	echo 'LD_LIBRARY_PATH="$(abspath $(LIBDIR))" $$d/rustc_binary $$@' >> $@
 	chmod +x $@
 
 $(BINDIR)hello_world: $(RUST_SRC)test/run-pass/hello.rs $(LIBDIR)libstd.rlib $(BINDIR)rustc