diff --git a/include/mruby.h b/include/mruby.h
index b77196310..1acedd161 100644
--- a/include/mruby.h
+++ b/include/mruby.h
@@ -34,6 +34,7 @@ extern "C" {
 
 #include <stdint.h>
 #include <stddef.h>
+#include <limits.h>
 
 #include "mrbconf.h"
 #include "mruby/value.h"
diff --git a/src/dump.c b/src/dump.c
index 393918b45..1854f7964 100644
--- a/src/dump.c
+++ b/src/dump.c
@@ -6,6 +6,7 @@
 
 #include <ctype.h>
 #include <string.h>
+#include <limits.h>
 #include "mruby/dump.h"
 #include "mruby/string.h"
 #include "mruby/irep.h"