diff --git a/brut.apktool/apktool-lib/src/main/java/brut/androlib/res/data/ResConfigFlags.java b/brut.apktool/apktool-lib/src/main/java/brut/androlib/res/data/ResConfigFlags.java
index 54167936..a56ec464 100644
--- a/brut.apktool/apktool-lib/src/main/java/brut/androlib/res/data/ResConfigFlags.java
+++ b/brut.apktool/apktool-lib/src/main/java/brut/androlib/res/data/ResConfigFlags.java
@@ -377,7 +377,9 @@ public class ResConfigFlags {
         // denies values-xxx, anything else
         if (language[0] != '\00' && localeScript.length == 0 && localeVariant.length == 0 &&
                 (region.length != 3 && language.length != 3) ||
-                (language.length == 3 && region.length == 2 && region[0] != '\00')) {
+                (language.length == 3 && region.length == 2 && region[0] != '\00' &&
+                        localeScript.length == 0 && localeVariant.length == 0)) {
+
             sb.append("-").append(language);
             if (region[0] != '\00') {
                 sb.append("-r").append(region);
@@ -390,16 +392,13 @@ public class ResConfigFlags {
             if (language[0] != '\00') {
                 sb.append(language);
             }
-            if (localeScript.length == 4 && region.length == 2) {
-                sb.append("+").append(localeScript).append("+").append(region);
+            if (localeScript.length == 4) {
+                sb.append("+").append(localeScript);
             }
-            if (region.length == 3) {
+            if ((region.length == 2 || region.length == 3) && region[0] != '\00') {
                 sb.append("+").append(region);
             }
             if (localeVariant.length >= 5) {
-                if (region.length == 2) {
-                    sb.append("+").append(region);
-                }
                 sb.append("+").append(toUpper(localeVariant));
             }
         }
diff --git a/brut.apktool/apktool-lib/src/test/java/brut/androlib/BuildAndDecodeTest.java b/brut.apktool/apktool-lib/src/test/java/brut/androlib/BuildAndDecodeTest.java
index 1d430c17..11f7c10a 100644
--- a/brut.apktool/apktool-lib/src/test/java/brut/androlib/BuildAndDecodeTest.java
+++ b/brut.apktool/apktool-lib/src/test/java/brut/androlib/BuildAndDecodeTest.java
@@ -202,11 +202,26 @@ public class BuildAndDecodeTest {
         compareValuesFiles("values-b+ast/strings.xml");
     }
 
+    @Test
+    public void twoLetterLangBcp47Test() throws BrutException, IOException {
+        compareValuesFiles("values-en-rUS/strings.xml");
+    }
+
     @Test
     public void variantBcp47Test() throws BrutException, IOException {
         compareValuesFiles("values-b+en+US+POSIX/strings.xml");
     }
 
+    @Test
+    public void fourpartBcp47Test() throws BrutException, IOException {
+        compareValuesFiles("values-b+ast+Latn+IT+AREVELA/strings.xml");
+    }
+
+    @Test
+    public void RegionLocaleBcp47Test() throws BrutException, IOException {
+        compareValuesFiles("values-b+en+Latn+419/strings.xml");
+    }
+
     @Test
     public void numericalRegionBcp47Test() throws BrutException, IOException {
         compareValuesFiles("values-b+eng+419/strings.xml");
diff --git a/brut.apktool/apktool-lib/src/test/resources/brut/apktool/testapp/res/values-b+ast+Latn+IT+AREVELA/strings.xml b/brut.apktool/apktool-lib/src/test/resources/brut/apktool/testapp/res/values-b+ast+Latn+IT+AREVELA/strings.xml
new file mode 100644
index 00000000..35eaf5ef
--- /dev/null
+++ b/brut.apktool/apktool-lib/src/test/resources/brut/apktool/testapp/res/values-b+ast+Latn+IT+AREVELA/strings.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="test1">test1</string>
+</resources>
\ No newline at end of file
diff --git a/brut.apktool/apktool-lib/src/test/resources/brut/apktool/testapp/res/values-b+en+Latn+419/strings.xml b/brut.apktool/apktool-lib/src/test/resources/brut/apktool/testapp/res/values-b+en+Latn+419/strings.xml
new file mode 100644
index 00000000..35eaf5ef
--- /dev/null
+++ b/brut.apktool/apktool-lib/src/test/resources/brut/apktool/testapp/res/values-b+en+Latn+419/strings.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="test1">test1</string>
+</resources>
\ No newline at end of file
diff --git a/brut.apktool/apktool-lib/src/test/resources/brut/apktool/testapp/res/values-en-rUS/strings.xml b/brut.apktool/apktool-lib/src/test/resources/brut/apktool/testapp/res/values-en-rUS/strings.xml
new file mode 100644
index 00000000..35eaf5ef
--- /dev/null
+++ b/brut.apktool/apktool-lib/src/test/resources/brut/apktool/testapp/res/values-en-rUS/strings.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="test1">test1</string>
+</resources>
\ No newline at end of file