diff --git a/rfc2047.c b/rfc2047.c
index c152922..1cfec5c 100644
--- a/rfc2047.c
+++ b/rfc2047.c
@@ -130,9 +130,12 @@ blaze822_decode_rfc2047(char *dst, char *src, size_t dlen, char *tgtenc)
 	iconv_t ic = (iconv_t)-1;
 	char *srcenc = 0;
 
+	char *startdst = dst;
+	size_t startdlen = dlen;
+
 	char *b = src;
 
-	// use memmem
+	// XXX use memmem
 	char *s = strstr(src, "=?");
 	if (!s)
 		goto nocodeok;
@@ -249,6 +252,12 @@ blaze822_decode_rfc2047(char *dst, char *src, size_t dlen, char *tgtenc)
 		dlen--;
 	}
 
+	if (memchr(startdst, 0, dst - startdst)) {
+		dst = startdst;
+		dlen = startdlen;
+		goto nocodeok;
+	}
+
 	*dst = 0;
 
 	if (ic != (iconv_t)-1)