diff --git a/testbn.c b/testbn.c
index 576c18b7..2ea4f459 100644
--- a/testbn.c
+++ b/testbn.c
@@ -55,7 +55,7 @@ int main(int argc, char **argv)
 
         while (*bufp && !isspace((unsigned char)*bufp))
             bufp++;
-        if (bufp)
+        if (*bufp)
             *bufp++ = '\0';
 
         while (*bufp) {