diff --git a/py/vm.c b/py/vm.c
index cab340ff38..77762a13af 100644
--- a/py/vm.c
+++ b/py/vm.c
@@ -157,7 +157,7 @@ dispatch_loop:
                         break;
 
                     case MP_BC_LOAD_CONST_SMALL_INT: {
-                        int num = 0;
+                        machine_int_t num = 0;
                         if ((ip[0] & 0x40) != 0) {
                             // Number is negative
                             num--;