diff --git a/sldns/str2wire.c b/sldns/str2wire.c
index c61a5964a..769ba1b79 100644
--- a/sldns/str2wire.c
+++ b/sldns/str2wire.c
@@ -604,7 +604,7 @@ sldns_affix_token(sldns_buffer* strbuf, char* token, size_t* token_len,
 	size_t addstrlen = 0;
 
 	/* add space */
-	if(addlen < 1) return 0;
+	if(addlen < 2) return 0;
 	token[*token_strlen] = ' ';
 	token[++(*token_strlen)] = 0;