diff --git a/gen/encoder.go b/gen/encoder.go
index 893d9e8..74c530f 100644
--- a/gen/encoder.go
+++ b/gen/encoder.go
@@ -274,14 +274,15 @@ func (g *Generator) genTypeEncoderNoCheck(t reflect.Type, in string, tags fieldT
 			} else {
 				return fmt.Errorf("interface type %v not supported: only interface{} and interfaces that implement json or easyjson Marshaling are allowed", t)
 			}
+		} else {
+			fmt.Fprintln(g.out, ws+"if m, ok := "+in+".(easyjson.Marshaler); ok {")
+			fmt.Fprintln(g.out, ws+"  m.MarshalEasyJSON(out)")
+			fmt.Fprintln(g.out, ws+"} else if m, ok := "+in+".(json.Marshaler); ok {")
+			fmt.Fprintln(g.out, ws+"  out.Raw(m.MarshalJSON())")
+			fmt.Fprintln(g.out, ws+"} else {")
+			fmt.Fprintln(g.out, ws+"  out.Raw(json.Marshal("+in+"))")
+			fmt.Fprintln(g.out, ws+"}")
 		}
-		fmt.Fprintln(g.out, ws+"if m, ok := "+in+".(easyjson.Marshaler); ok {")
-		fmt.Fprintln(g.out, ws+"  m.MarshalEasyJSON(out)")
-		fmt.Fprintln(g.out, ws+"} else if m, ok := "+in+".(json.Marshaler); ok {")
-		fmt.Fprintln(g.out, ws+"  out.Raw(m.MarshalJSON())")
-		fmt.Fprintln(g.out, ws+"} else {")
-		fmt.Fprintln(g.out, ws+"  out.Raw(json.Marshal("+in+"))")
-		fmt.Fprintln(g.out, ws+"}")
 	default:
 		return fmt.Errorf("don't know how to encode %v", t)
 	}