diff --git a/build_ops_obj.sh b/build_ops_obj.sh
index 0cb13b4..adf3959 100644
--- a/build_ops_obj.sh
+++ b/build_ops_obj.sh
@@ -1,5 +1,5 @@
 #!/bin/bash
 set -e
 
-mkdir -d src/copapy/obj
+mkdir -p src/copapy/obj
 gcc -c src/copapy/ops.c -o src/copapy/obj/ops_x86_64.o
\ No newline at end of file