1 files changed, 1 insertions, 0 deletions
diff --git a/src/class.c b/src/class.c
index 287d63da3..126ac0004 100644
--- a/src/class.c
+++ b/src/class.c
@@ -17,6 +17,7 @@
 #include <mruby/data.h>
 #include <mruby/istruct.h>
 #include <mruby/opcode.h>
+#include <mruby/presym.h>
 
 union mt_ptr {
   struct RProc *proc;