1 files changed, 1 insertions, 1 deletions
diff --git a/fdflush.c b/fdflush.c
index 51b0c2b..a244e8d 100644
--- a/fdflush.c
+++ b/fdflush.c
@@ -31,7 +31,7 @@ extern int fdflush_main(int argc, char **argv)
 {
     int	value;
     int	fd;
-    if ( **(argv+1) == '-' ) {
+    if ( argc <= 1 || **(argv++) == '-' ) {
 	usage( "fdflush device\n");
     }