diff --git a/src/afl-as.c b/src/afl-as.c
index 0ed47d8c..7d70bfcd 100644
--- a/src/afl-as.c
+++ b/src/afl-as.c
@@ -152,7 +152,7 @@ static void edit_params(int argc, char **argv) {
 
     /* The Apple case is a bit different... */
 
-    if (!strcmp(argv[i], "-arch") && i + 1 < argc) {
+    if (!strcmp(argv[i], "-arch") && i + 1 < (u32)argc) {
 
       if (!strcmp(argv[i + 1], "x86_64"))
         use_64bit = 1;
diff --git a/unicorn_mode/unicornafl b/unicorn_mode/unicornafl
index c6d66471..c21a5ebb 160000
--- a/unicorn_mode/unicornafl
+++ b/unicorn_mode/unicornafl
@@ -1 +1 @@
-Subproject commit c6d6647161a32bae88785a618fcd828d1711d9e6
+Subproject commit c21a5ebbbeb2dbaab84435642c49952060778243