1 files changed, 1 insertions, 0 deletions
diff --git a/gc.c b/gc.c
index d0144f5266..b3edd4c54b 100644
--- a/gc.c
+++ b/gc.c
@@ -14,6 +14,7 @@
 #define rb_data_object_alloc rb_data_object_alloc
 #define rb_data_typed_object_alloc rb_data_typed_object_alloc
 
+#include "ruby/encoding.h"
 #include "ruby/io.h"
 #include "ruby/st.h"
 #include "ruby/re.h"