diff --git a/apktool-lib/src/main/java/brut/androlib/res/decoder/ResFileDecoder.java b/apktool-lib/src/main/java/brut/androlib/res/decoder/ResFileDecoder.java
index 57b2125f..c5d67d52 100644
--- a/apktool-lib/src/main/java/brut/androlib/res/decoder/ResFileDecoder.java
+++ b/apktool-lib/src/main/java/brut/androlib/res/decoder/ResFileDecoder.java
@@ -60,7 +60,7 @@ public class ResFileDecoder {
                 decode(inDir, inFileName, outDir, outFileName, "raw");
                 return;
             }
-            if (typeName.equals("drawable")) {
+            if (typeName.equals("drawable") || typeName.equals("mipmap")) {
                 if (inFileName.toLowerCase().endsWith(".9.png")) {
                     outFileName = outResName + ".9" + ext;