diff --git a/tools/list_numpy_dlls.sh b/tools/list_numpy_dlls.sh
index fedd2097ba67..39aaccf6ed2c 100644
--- a/tools/list_numpy_dlls.sh
+++ b/tools/list_numpy_dlls.sh
@@ -5,5 +5,5 @@ py_ver=${1}
 site_packages=`python${py_ver} -m pip show numpy | \
 		    grep Location | cut -d " " -f 2 -`;
 dll_list=`for name in $(python${py_ver} -m pip show -f numpy | \
-			     grep -F .dll); do echo ${site_packages}/${name}; done`
+			     grep -E -e '\.dll$'); do echo ${site_packages}/${name}; done`
 echo ${dll_list}