diff --git a/src/platforms/posix/drivers/accelsim/accelsim.cpp b/src/platforms/posix/drivers/accelsim/accelsim.cpp
index 061715984b..a7cc7d9d72 100644
--- a/src/platforms/posix/drivers/accelsim/accelsim.cpp
+++ b/src/platforms/posix/drivers/accelsim/accelsim.cpp
@@ -1168,7 +1168,7 @@ accelsim_main(int argc, char *argv[])
 		}
 	}
 
-	if (argc <= 1) {
+	if (myoptind >= argc) {
 		accelsim::usage();
 		return 1;
 	}
diff --git a/src/platforms/posix/drivers/gyrosim/gyrosim.cpp b/src/platforms/posix/drivers/gyrosim/gyrosim.cpp
index 8e647453df..810a874225 100644
--- a/src/platforms/posix/drivers/gyrosim/gyrosim.cpp
+++ b/src/platforms/posix/drivers/gyrosim/gyrosim.cpp
@@ -1482,6 +1482,11 @@ gyrosim_main(int argc, char *argv[])
 		}
 	}
 
+	if (myoptind >= argc) {
+		gyrosim::usage();
+		return 1;
+	}
+
 	const char *verb = argv[myoptind];
 
 	/*