1 files changed, 1 insertions, 1 deletions

diff --git a/math.c b/math.c
index 3b459f62e..96afafdef 100644
--- a/math.c
+++ b/math.c
@@ -130,7 +130,7 @@ static void stack_machine(const char *argument)
 
 int math_main(int argc, char **argv)
 {
-        if (argc < 1 || *argv[1]=='-')
+        if (argc <= 1 || *argv[1]=='-')
                 usage(math_usage);
         while (argc >= 2) {
                 stack_machine(argv[1]);