1 files changed, 1 insertions, 1 deletions
diff --git a/variable.c b/variable.c
index 16859c2cab..5f15fbc74d 100644
--- a/variable.c
+++ b/variable.c
@@ -1093,7 +1093,7 @@ obj_ivar_each(VALUE obj, int (*func)(ANYARGS), st_data_t arg)
         return;
 
     data.obj = obj;
-    data.func = func;
+    data.func = (int (*)(ID key, VALUE val, st_data_t arg))func;
     data.arg = arg;
 
     st_foreach_safe(tbl, obj_ivar_i, (st_data_t)&data);