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-rw-r--r--generic/tclStringRep.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/generic/tclStringRep.h b/generic/tclStringRep.h
index 25b854e..59e9499 100644
--- a/generic/tclStringRep.h
+++ b/generic/tclStringRep.h
@@ -67,7 +67,7 @@ typedef struct String {
#define STRING_MAXCHARS \
(int)(((size_t)UINT_MAX - 1 - TclOffset(String, unicode))/sizeof(Tcl_UniChar))
#define STRING_SIZE(numChars) \
- (TclOffset(String, unicode) + ((numChars + 1) * sizeof(Tcl_UniChar)))
+ (TclOffset(String, unicode) + (((numChars) + 1) * sizeof(Tcl_UniChar)))
#define stringCheckLimits(numChars) \
do { \
if ((numChars) < 0 || (numChars) > STRING_MAXCHARS) { \