2 files changed, 2 insertions, 0 deletions
diff --git a/mrbgems/mruby-io/src/file.c b/mrbgems/mruby-io/src/file.c
index 58f4bcc6f..8e7d64958 100644
--- a/mrbgems/mruby-io/src/file.c
+++ b/mrbgems/mruby-io/src/file.c
@@ -8,6 +8,7 @@
 #include "mruby/string.h"
 #include "mruby/ext/io.h"
 #include "mruby/error.h"
+#include "mruby/presym.h"
 
 #include <sys/types.h>
 #include <sys/stat.h>
diff --git a/mrbgems/mruby-io/src/io.c b/mrbgems/mruby-io/src/io.c
index 31ea572a4..b9d136a5a 100644
--- a/mrbgems/mruby-io/src/io.c
+++ b/mrbgems/mruby-io/src/io.c
@@ -11,6 +11,7 @@
 #include "mruby/variable.h"
 #include "mruby/ext/io.h"
 #include "mruby/error.h"
+#include "mruby/presym.h"
 
 #include <sys/types.h>
 #include <sys/stat.h>