diff --git a/tools/macosx/stlink_upload b/tools/macosx/stlink_upload
index 486bb3927..cb40548fa 100755
--- a/tools/macosx/stlink_upload
+++ b/tools/macosx/stlink_upload
@@ -1,2 +1,2 @@
 #!/bin/bash
-$(dirname $0)/stlink/st-flash write "$1" 0x8000000 
+"$(dirname "$0")"/stlink/st-flash write "$1" 0x8000000