diff --git a/src/unp64.c b/src/unp64.c
index 800c8a3..4ede1dd 100644
--- a/src/unp64.c
+++ b/src/unp64.c
@@ -496,7 +496,7 @@ looprecurse:
                 case 'u':
                     Unp.WrMemF=1;
                     printf("Clean unwritten memory\n");
-                    if (argv[p]+2)
+                    if (argv[p][2])
                     {
                     	str_to_int(argv[p]+2, &Unp.WrMemV);
                         q=Unp.WrMemV&0xff;
@@ -509,7 +509,7 @@ looprecurse:
                 case 'l':
                     Unp.LfMemF=info->end;
                     printf("Clean memory-end leftovers\n");
-                    if (argv[p]+2)
+                    if (argv[p][2])
                     {
                     	str_to_int(argv[p]+2, &Unp.LfMemV);
                     }