diff --git a/procps/fuser.c b/procps/fuser.c
index 850626e..35d77ed 100644
--- a/procps/fuser.c
+++ b/procps/fuser.c
@@ -326,6 +326,9 @@
 	int killsig = SIGTERM;
 	int success = 1;
 
+	if (argc < 2)
+		bb_show_usage();
+
 	fni = xmalloc(sizeof(int));
 	for(i=1;i<argc;i++) {
 		optn = fuser_option(argv[i]);