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-rw-r--r--ext/-test-/string/enc_associate.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/-test-/string/enc_associate.c b/ext/-test-/string/enc_associate.c
index 2ecc9c0227..d6614fb298 100644
--- a/ext/-test-/string/enc_associate.c
+++ b/ext/-test-/string/enc_associate.c
@@ -1,4 +1,5 @@
#include "ruby.h"
+#include "ruby/encoding.h"
VALUE
bug_str_enc_associate(VALUE str, VALUE enc)