1 files changed, 9 insertions, 0 deletions
diff --git a/eval.c b/eval.c
index cfb1d1e6..675422e2 100644
--- a/eval.c
+++ b/eval.c
@@ -493,8 +493,15 @@ static int
 posix_compare(NODE *s1, NODE *s2)
 {
 	int ret = 0;
+	char save1, save2;
 	size_t l = 0;
 
+	save1 = s1->stptr[s1->stlen];
+	s1->stptr[s1->stlen] = '\0';
+
+	save2 = s2->stptr[s2->stlen];
+	s2->stptr[s2->stlen] = '\0';
+
 	if (gawk_mb_cur_max == 1) {
 		if (strlen(s1->stptr) == s1->stlen && strlen(s2->stptr) == s2->stlen)
 			ret = strcoll(s1->stptr, s2->stptr);
@@ -556,6 +563,8 @@ posix_compare(NODE *s1, NODE *s2)
 	}
 #endif
 
+	s1->stptr[s1->stlen] = save1;
+	s2->stptr[s2->stlen] = save2;
 	return ret;
 }