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-rw-r--r--Src/subst.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/Src/subst.c b/Src/subst.c
index 87a56c3c6..465fe970f 100644
--- a/Src/subst.c
+++ b/Src/subst.c
@@ -3362,13 +3362,15 @@ colonsubscript:
 		    return NULL;
 		}
 		if (*check_offset2) {
+		    char *nextp;
 		    check_offset = check_colon_subscript(check_offset2 + 1,
-							 &check_offset2);
-		    if (*check_offset2 && *check_offset2 != ':') {
-			zerr("invalid length: %s", check_offset);
-			return NULL;
-		    }
+							 &nextp);
 		    if (check_offset) {
+			check_offset2 = nextp;
+			if (*check_offset2 && *check_offset2 != ':') {
+			    zerr("invalid length: %s", check_offset);
+			    return NULL;
+			}
 			length = mathevali(check_offset);
 			length_set = 1;
 			if (errflag)