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-rw-r--r--generic/tclOptimize.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/generic/tclOptimize.c b/generic/tclOptimize.c
index 827d89d..03daa40 100644
--- a/generic/tclOptimize.c
+++ b/generic/tclOptimize.c
@@ -34,7 +34,7 @@ static void TrimUnreachable(CompileEnv *envPtr);
#define AddrLength(address) \
(tclInstructionTable[*(unsigned char *)(address)].numBytes)
#define InstLength(instruction) \
- (tclInstructionTable[(unsigned char)(instruction)].numBytes)
+ (tclInstructionTable[UCHAR(instruction)].numBytes)
/*
* ----------------------------------------------------------------------