diff --git a/java/libphonenumber/src/com/google/i18n/phonenumbers/PhoneNumberUtil.java b/java/libphonenumber/src/com/google/i18n/phonenumbers/PhoneNumberUtil.java
index c49189fa2..1c03a70d4 100644
--- a/java/libphonenumber/src/com/google/i18n/phonenumbers/PhoneNumberUtil.java
+++ b/java/libphonenumber/src/com/google/i18n/phonenumbers/PhoneNumberUtil.java
@@ -3020,9 +3020,12 @@ public class PhoneNumberUtil {
       if (transformRule == null || transformRule.length() == 0
           || prefixMatcher.group(numOfGroups) == null) {
         // If the original number was viable, and the resultant number is not, we return.
-        if (isViableOriginalNumber
+        if ((isViableOriginalNumber
             && !matcherApi.matchNationalNumber(
-                number.substring(prefixMatcher.end()), generalDesc, false)) {
+                number.substring(prefixMatcher.end()), generalDesc, false))|| 
+                (getNumberTypeHelper(number.toString(), metadata) != PhoneNumberType.UNKNOWN
+                && getNumberTypeHelper(number.substring(prefixMatcher.end()), metadata)
+                    == PhoneNumberType.UNKNOWN)) {
           return false;
         }
         if (carrierCode != null && numOfGroups > 0 && prefixMatcher.group(numOfGroups) != null) {
diff --git a/java/libphonenumber/test/com/google/i18n/phonenumbers/PhoneNumberUtilTest.java b/java/libphonenumber/test/com/google/i18n/phonenumbers/PhoneNumberUtilTest.java
index cb56077e4..082245e53 100644
--- a/java/libphonenumber/test/com/google/i18n/phonenumbers/PhoneNumberUtilTest.java
+++ b/java/libphonenumber/test/com/google/i18n/phonenumbers/PhoneNumberUtilTest.java
@@ -1866,6 +1866,21 @@ public class PhoneNumberUtilTest extends TestMetadataTestCase {
     assertEquals("Should have had no change - after stripping, it wouldn't have matched "
         + "the national rule.",
         strippedNumber, numberToStrip.toString());
+    metadata.setNationalPrefixForParsing("0|80?");
+    metadata.setPremiumRate(
+        metadata
+            .getGeneralDescBuilder()
+            .setNationalNumberPattern("(?:810|902)\d{7}"));
+    metadata.setPremiumRate(metadata.getGeneralDescBuilder().addPossibleLength(10));
+    numberToStrip = new StringBuilder("8105261733");
+    strippedNumber = "8105261733";
+    assertFalse(
+        phoneUtil.maybeStripNationalPrefixAndCarrierCode(numberToStrip, metadata.build(), null));
+    assertEquals(
+        "Should have had no change - after stripping, it wouldn't have matched "
+            + "the national rule.",
+        strippedNumber,
+        numberToStrip.toString());
     // Test extracting carrier selection code.
     metadata.setNationalPrefixForParsing("0(81)?");
     numberToStrip = new StringBuilder("08122123456");