1 files changed, 1 insertions, 0 deletions
diff --git a/string.c b/string.c
index 2563df6d4c..9eab86398b 100644
--- a/string.c
+++ b/string.c
@@ -13,6 +13,7 @@
 
 #include "internal.h"
 #include "ruby/re.h"
+#include "encindex.h"
 #include "probes.h"
 #include "gc.h"
 #include <assert.h>