diff --git a/bin/dib-lint b/bin/dib-lint
index 24877849..2a797958 100755
--- a/bin/dib-lint
+++ b/bin/dib-lint
@@ -80,7 +80,7 @@ for i in $(find elements -type f   \
         fi
 
         # Ensure 4 spaces indent are used
-        if [ "$(file -b --mime-type $i)" = "text/x-python" ]; then
+        if [[ "$(file -b -k --mime-type $i)" =~ "text/x-python" ]]; then
             flake8 $i || error "$i failed flake8"
         else
             if ! excluded indent ; then