diff --git a/dropbear_lint.sh b/dropbear_lint.sh
index 25a4b7d..4e8d33b 100755
--- a/dropbear_lint.sh
+++ b/dropbear_lint.sh
@@ -3,6 +3,6 @@
 EXITCODE=0
 
 # #ifdef instead of #if
-grep '#ifdef DROPBEAR' -I *.c *.h && EXITCODE=1
+grep '#ifdef DROPBEAR' -I -- *.c *.h && EXITCODE=1
 
 exit $EXITCODE