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-rw-r--r--ext/-test-/string/cstr.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/-test-/string/cstr.c b/ext/-test-/string/cstr.c
index 2a41b932db..71eafdb703 100644
--- a/ext/-test-/string/cstr.c
+++ b/ext/-test-/string/cstr.c
@@ -1,3 +1,4 @@
+#include "ruby/encoding.h"
#include "internal.h"
static VALUE