diff --git a/src/detect-asn1.c b/src/detect-asn1.c
index 66ee57aba1..016a16202b 100644
--- a/src/detect-asn1.c
+++ b/src/detect-asn1.c
@@ -967,7 +967,7 @@ int DetectAsn1Test06(void) {
         if (ac == NULL)
             return 0;
 
-        uint16_t len = 261;
+        uint16_t len = 260;
 
         SCAsn1CtxInit(ac, str, len);