diff --git a/src/main/java/com/google/api/generator/gapic/composer/utils/PackageChecker.java b/src/main/java/com/google/api/generator/gapic/composer/utils/PackageChecker.java
index 9765df0425..18a50a622e 100644
--- a/src/main/java/com/google/api/generator/gapic/composer/utils/PackageChecker.java
+++ b/src/main/java/com/google/api/generator/gapic/composer/utils/PackageChecker.java
@@ -20,6 +20,8 @@
 import java.util.regex.Pattern;
 
 public class PackageChecker {
+
+  // Nothing to initialize.
   private PackageChecker() {}
 
   /**
@@ -30,13 +32,18 @@ public static boolean isGaApi(String pakkage) {
     String[] packageComponents = pakkage.split("\\.");
     Preconditions.checkState(
         packageComponents.length > 0, "No subcomponents found in Java package %s", pakkage);
-    String versionComponent = packageComponents[packageComponents.length - 1];
-    Matcher matcher = Pattern.compile("^v[0-9]+").matcher(versionComponent);
-    Preconditions.checkState(
-        matcher.find(),
-        "No version component found in last subpackage %s of %s",
-        versionComponent,
-        pakkage);
+    String versionComponent = null;
+    Matcher matcher = null;
+    boolean isFound = false;
+    for (int i = packageComponents.length - 1; i >= 0; i--) {
+      versionComponent = packageComponents[i];
+      matcher = Pattern.compile("^v[0-9]+").matcher(versionComponent);
+      isFound = matcher.find();
+      if (isFound) {
+        break;
+      }
+    }
+    Preconditions.checkState(isFound, "No version component found in package %s", pakkage);
     String versionSubstr = versionComponent.replace(matcher.group(), "");
     return Strings.isNullOrEmpty(versionSubstr)
         || (!versionSubstr.contains("alpha") && !versionSubstr.contains("beta"));
diff --git a/src/test/java/com/google/api/generator/gapic/composer/utils/PackageCheckerTest.java b/src/test/java/com/google/api/generator/gapic/composer/utils/PackageCheckerTest.java
index 323f5e0100..7e514599d3 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/utils/PackageCheckerTest.java
+++ b/src/test/java/com/google/api/generator/gapic/composer/utils/PackageCheckerTest.java
@@ -23,6 +23,8 @@
 public class PackageCheckerTest {
   @Test
   public void isGaApi_normalExpectedPackageStructure() {
+    assertTrue(PackageChecker.isGaApi("com.google.cloud.dataproc.v1.services"));
+    assertTrue(PackageChecker.isGaApi("com.google.cloud.v1.foobar.services"));
     assertTrue(PackageChecker.isGaApi("com.google.cloud.dataproc.v1"));
     assertTrue(PackageChecker.isGaApi("com.google.cloud.dataproc.v999"));
     assertTrue(PackageChecker.isGaApi("com.google.cloud.dataproc.v12345a"));
@@ -40,7 +42,7 @@ public void isGaApi_normalExpectedPackageStructure() {
   public void isGaApi_invalidPackageStructure() {
     assertThrows(
         IllegalStateException.class,
-        () -> PackageChecker.isGaApi("com.google.cloud.dataproc.v1.foobar"));
+        () -> PackageChecker.isGaApi("com.google.cloud.dataproc.foo.bar"));
     assertThrows(IllegalStateException.class, () -> PackageChecker.isGaApi(""));
   }
 }