diff --git a/compile.c b/compile.c
index 18abaca22b..4cd1863e1b 100644
--- a/compile.c
+++ b/compile.c
@@ -8760,7 +8760,7 @@ ibf_load_iseq_each(const struct ibf_load *load, rb_iseq_t *iseq, ibf_offset_t of
 
     ISEQ_COVERAGE_SET(iseq, Qnil);
     ISEQ_ORIGINAL_ISEQ_CLEAR(iseq);
-    iseq->body->variable.flip_count = body->variable.flip_count;
+    iseq->body->variable.flip_count = (int)body->variable.flip_count;
 
     {
 	VALUE realpath = Qnil, path = ibf_load_object(load, body->location.pathobj);
diff --git a/iseq.h b/iseq.h
index 0a0edd9b7a..a39d827670 100644
--- a/iseq.h
+++ b/iseq.h
@@ -35,10 +35,10 @@ rb_call_info_kw_arg_bytes(int keyword_len)
 
 #define ISEQ_FLIP_CNT(iseq) (iseq)->body->variable.flip_count
 
-static inline rb_snum_t
+static inline int
 ISEQ_FLIP_CNT_INCREMENT(const rb_iseq_t *iseq)
 {
-    rb_snum_t cnt = iseq->body->variable.flip_count;
+    int cnt = iseq->body->variable.flip_count;
     iseq->body->variable.flip_count += 1;
     return cnt;
 }
diff --git a/vm_core.h b/vm_core.h
index 9b8aede35c..24ecc9be54 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -412,7 +412,7 @@ struct rb_iseq_constant_body {
     struct rb_call_cache *cc_entries; /* size is ci_size = ci_kw_size */
 
     struct {
-      rb_snum_t flip_count;
+      rb_num_t flip_count;
       VALUE coverage;
       VALUE original_iseq;
     } variable;