diff --git a/http2/h2c/h2c.go b/http2/h2c/h2c.go
index 03a31c8..07c5c9a 100644
--- a/http2/h2c/h2c.go
+++ b/http2/h2c/h2c.go
@@ -118,6 +118,9 @@
 
 	buf := make([]byte, len(expectedBody))
 	n, err := io.ReadFull(rw, buf)
+	if err != nil {
+		return nil, fmt.Errorf("could not read from the buffer: %s", err)
+	}
 
 	if string(buf[:n]) == expectedBody {
 		c := &rwConn{