diff --git a/include/mruby.h b/include/mruby.h
index 2d87a13fe..0fd5ffe5f 100644
--- a/include/mruby.h
+++ b/include/mruby.h
@@ -1543,6 +1543,8 @@ mrbmemset(void *s, int c, size_t n)
 #define memset(a,b,c) mrbmemset(a,b,c)
 #endif
 
+#define mrb_int_hash_func(mrb,key) (uint32_t)((key)^((key)<<2)^((key)>>2))
+
 MRB_END_DECL
 
 #endif  /* MRUBY_H */
diff --git a/include/mruby/khash.h b/include/mruby/khash.h
index c413ebbb7..c60320428 100644
--- a/include/mruby/khash.h
+++ b/include/mruby/khash.h
@@ -264,7 +264,7 @@ kh_fill_flags(uint8_t *p, uint8_t c, size_t len)
 #define kh_size(h) ((h)->size)
 #define kh_n_buckets(h) ((h)->n_buckets)
 
-#define kh_int_hash_func(mrb,key) (khint_t)((key)^((key)<<2)^((key)>>2))
+#define kh_int_hash_func(mrb,key) mrb_int_hash_func(mrb,key)
 #define kh_int_hash_equal(mrb,a, b) (a == b)
 #define kh_int64_hash_func(mrb,key) (khint_t)((key)>>33^(key)^(key)<<11)
 #define kh_int64_hash_equal(mrb,a, b) (a == b)