1 files changed, 1 insertions, 0 deletions
diff --git a/src/gc.c b/src/gc.c
index 5943a0e3b..98a2237d5 100644
--- a/src/gc.c
+++ b/src/gc.c
@@ -22,6 +22,7 @@
 #include <mruby/gc.h>
 #include <mruby/error.h>
 #include <mruby/throw.h>
+#include <mruby/presym.h>
 
 /*
   = Tri-color Incremental Garbage Collection