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-rw-r--r--include/ruby/encoding.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/ruby/encoding.h b/include/ruby/encoding.h
index 500725e72e..2cac1bcb53 100644
--- a/include/ruby/encoding.h
+++ b/include/ruby/encoding.h
@@ -198,7 +198,7 @@ RUBY_EXTERN VALUE rb_cEncoding;
#define ENC_DUMMY_FLAG (1<<24)
#define ENC_INDEX_MASK (~(~0U<<24))
-#define ENC_TO_ENCINDEX(enc) ((enc)->ruby_encoding_index & ENC_INDEX_MASK)
+#define ENC_TO_ENCINDEX(enc) (int)((enc)->ruby_encoding_index & ENC_INDEX_MASK)
#define ENC_DUMMY_P(enc) ((enc)->ruby_encoding_index & ENC_DUMMY_FLAG)
#define ENC_SET_DUMMY(enc) ((enc)->ruby_encoding_index |= ENC_DUMMY_FLAG)