diff --git a/proto/text.go b/proto/text.go
index 9cd7b69..a8c5429 100644
--- a/proto/text.go
+++ b/proto/text.go
@@ -410,15 +410,27 @@
 			continue
 		}
 
-		fmt.Fprintf(w, "[%s]:", desc.Name)
-		if !w.compact {
-			w.WriteByte(' ')
+		// Repeated extensions will appear as a slice.
+		if !desc.repeated() {
+			writeExtension(w, desc.Name, pb)
+		} else {
+			v := reflect.ValueOf(pb)
+			for i := 0; i < v.Len(); i++ {
+				writeExtension(w, desc.Name, v.Index(i).Interface())
+			}
 		}
-		writeAny(w, reflect.ValueOf(pb), nil)
-		w.WriteByte('\n')
 	}
 }
 
+func writeExtension(w *textWriter, name string, pb interface{}) {
+	fmt.Fprintf(w, "[%s]:", name)
+	if !w.compact {
+		w.WriteByte(' ')
+	}
+	writeAny(w, reflect.ValueOf(pb), nil)
+	w.WriteByte('\n')
+}
+
 func marshalText(w io.Writer, pb interface{}, compact bool) {
 	if pb == nil {
 		w.Write([]byte("<nil>"))