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-rw-r--r--transcode_data.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/transcode_data.h b/transcode_data.h
index 4dd10abb89..2007eb06d3 100644
--- a/transcode_data.h
+++ b/transcode_data.h
@@ -56,7 +56,7 @@ RUBY_SYMBOL_EXPORT_BEGIN
0xffffffffU))
#define o4(b0,b1,b2,b3) (PType(((((unsigned char)(b1))<<8)|\
(((unsigned char)(b2))<<16)|\
- (((unsigned char)(b3))<<24)|\
+ (((unsigned int)(unsigned char)(b3))<<24)|\
((((unsigned char)(b0))&0x07)<<5)|\
FOURbt)&\
0xffffffffU))