diff --git a/test/regress_http.c b/test/regress_http.c
index 217f1e00..f24e40ca 100644
--- a/test/regress_http.c
+++ b/test/regress_http.c
@@ -232,6 +232,8 @@ evbuffer_datacmp(struct evbuffer *buf, const char *s)
 		return -1;
 
 	d = evbuffer_pullup(buf, s_sz);
+	if (!d)
+		d = (unsigned char *)"";
 	if ((r = memcmp(d, s, s_sz)))
 		return r;