diff --git a/modules/l4ssh/matcher.go b/modules/l4ssh/matcher.go
index af8aa07..931e252 100644
--- a/modules/l4ssh/matcher.go
+++ b/modules/l4ssh/matcher.go
@@ -40,9 +40,9 @@ func (MatchSSH) CaddyModule() caddy.ModuleInfo {
 // Match returns true if the connection looks like SSH.
 func (m MatchSSH) Match(cx *layer4.Connection) (bool, error) {
 	p := make([]byte, len(sshPrefix))
-	n, err := io.ReadFull(cx, p)
-	if err != nil || n < len(sshPrefix) {
-		return false, nil
+	_, err := io.ReadFull(cx, p)
+	if err != nil {
+		return false, err
 	}
 	return bytes.Equal(p, sshPrefix), nil
 }
diff --git a/modules/l4xmpp/matcher.go b/modules/l4xmpp/matcher.go
index b9a2d45..a244583 100644
--- a/modules/l4xmpp/matcher.go
+++ b/modules/l4xmpp/matcher.go
@@ -40,15 +40,15 @@ func (MatchXMPP) CaddyModule() caddy.ModuleInfo {
 // Match returns true if the connection looks like XMPP.
 func (m MatchXMPP) Match(cx *layer4.Connection) (bool, error) {
 	p := make([]byte, minXmppLength)
-	n, err := io.ReadFull(cx, p)
-	if err != nil || n < minXmppLength { // needs at least 50 (fix for adium/pidgin)
-		return false, nil
+	_, err := io.ReadFull(cx, p)
+	if err != nil {
+		return false, err
 	}
 	return strings.Contains(string(p), xmppWord), nil
 }
 
 var xmppWord = "jabber"
-var minXmppLength = 50
+var minXmppLength = 50 // needs at least 50 (fix for adium/pidgin)
 
 // Interface guard
 var _ layer4.ConnMatcher = (*MatchXMPP)(nil)