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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 fdbe119..425f08c 100644
--- a/generic/tclStringRep.h
+++ b/generic/tclStringRep.h
@@ -69,7 +69,7 @@ typedef struct {
} String;
#define STRING_SIZE(numChars) \
- (offsetof(String, unicode) + (((numChars) + 1U) * sizeof(Tcl_UniChar)))
+ (offsetof(String, unicode) + sizeof(Tcl_UniChar) + ((numChars) * sizeof(Tcl_UniChar)))
#define stringAttemptAlloc(numChars) \
(String *) Tcl_AttemptAlloc(STRING_SIZE(numChars))
#define stringAlloc(numChars) \