diff --git a/NEWS b/NEWS
index 57790af5..b3cda2c3 100644
--- a/NEWS
+++ b/NEWS
@@ -18,6 +18,7 @@ procps-ng NEXT
   * vmstat: Wide mode gives wider proc columns             merge #48
   * watch: Add environment variable for interval           merge #62
   * watch: Add no linewrap option                          issue #182
+  * free,uptime,slabtop: complain about extra ops          issue #181
 
 procps-ng-3.3.16
 ----------------
diff --git a/free.c b/free.c
index 6a075041..5fb3d7d3 100644
--- a/free.c
+++ b/free.c
@@ -342,6 +342,8 @@ int main(int argc, char **argv)
 		default:
 			usage(stderr);
 		}
+	if (optind != argc)
+	    usage(stderr);
 
 	if (procps_meminfo_new(&mem_info) < 0)
 	    xerrx(EXIT_FAILURE,
diff --git a/slabtop.c b/slabtop.c
index 9966af1e..64a52da0 100644
--- a/slabtop.c
+++ b/slabtop.c
@@ -202,6 +202,8 @@ static void parse_opts (int argc, char **argv)
             usage(stderr);
         }
     }
+    if (optind != argc)
+        usage(stderr);
 }
 
 static void print_summary (void)
diff --git a/uptime.c b/uptime.c
index 2fdef849..c5eaa3e7 100644
--- a/uptime.c
+++ b/uptime.c
@@ -106,6 +106,9 @@ int main(int argc, char **argv)
             usage(stderr);
         }
 
+    if (optind != argc)
+        usage(stderr);
+
     if (p)
         printf("%s\n", procps_uptime_sprint_short());
     else