diff --git a/its/core-it-suite/src/test/java/org/apache/maven/it/IntegrationTestSuite.java b/its/core-it-suite/src/test/java/org/apache/maven/it/IntegrationTestSuite.java
index 64f56b52fd..54364e5c0a 100644
--- a/its/core-it-suite/src/test/java/org/apache/maven/it/IntegrationTestSuite.java
+++ b/its/core-it-suite/src/test/java/org/apache/maven/it/IntegrationTestSuite.java
@@ -95,6 +95,7 @@ public class IntegrationTestSuite
suite.addTestSuite( MavenITmng3940EnvVarInterpolationTest.class );
suite.addTestSuite( MavenITmng3938MergePluginExecutionsTest.class );
suite.addTestSuite( MavenITmng3937MergedPluginExecutionGoalsTest.class );
+ suite.addTestSuite( MavenITmng3933OsTriggeredExternalProfileTest.class );
suite.addTestSuite( MavenITmng3927PluginDefaultExecutionConfigTest.class );
suite.addTestSuite( MavenITmng3925MergedPluginExecutionOrderTest.class );
suite.addTestSuite( MavenITmng3924XmlMarkupInterpolationTest.class );
diff --git a/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng3933OsTriggeredExternalProfileTest.java b/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng3933OsTriggeredExternalProfileTest.java
new file mode 100644
index 0000000000..5386a09659
--- /dev/null
+++ b/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng3933OsTriggeredExternalProfileTest.java
@@ -0,0 +1,72 @@
+package org.apache.maven.it;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import org.apache.maven.it.Verifier;
+import org.apache.maven.it.util.ResourceExtractor;
+import org.apache.maven.it.util.Os;
+
+import java.io.File;
+import java.util.Properties;
+
+/**
+ * This is a test set for MNG-3933.
+ *
+ * @author Benjamin Bentmann
+ * @version $Id$
+ */
+public class MavenITmng3933OsTriggeredExternalProfileTest
+ extends AbstractMavenIntegrationTestCase
+{
+
+ public MavenITmng3933OsTriggeredExternalProfileTest()
+ {
+ super( "(2.0.10,2.1.0-M1),(2.1.0-M1,)" );
+ }
+
+ /**
+ * Test that OS-triggered profiles from an external profiles.xml are activated.
+ */
+ public void testitMNG3933()
+ throws Exception
+ {
+ File testDir = ResourceExtractor.simpleExtractResources( getClass(), "/mng-3933" );
+
+ Verifier verifier = new Verifier( testDir.getAbsolutePath() );
+ verifier.setAutoclean( false );
+ verifier.deleteDirectory( "target" );
+ verifier.executeGoal( "validate" );
+ verifier.verifyErrorFreeLog();
+ verifier.resetStreams();
+
+ Properties props = verifier.loadProperties( "target/profile.properties" );
+ if ( Os.isFamily( Os.FAMILY_WINDOWS ) || Os.isFamily( Os.FAMILY_MAC ) || Os.isFamily( Os.FAMILY_UNIX ) )
+ {
+ assertEquals( "PASSED", props.getProperty( "project.properties.profileProperty" ) );
+ }
+ else
+ {
+ System.out.println();
+ System.out.println( "[WARNING] Skipping test on unrecognized OS: " + Os.OS_NAME );
+ System.out.println();
+ }
+ }
+
+}
diff --git a/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng3944BasedirInterpolationTest.java b/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng3944BasedirInterpolationTest.java
index 797e9c3134..fca192530e 100644
--- a/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng3944BasedirInterpolationTest.java
+++ b/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng3944BasedirInterpolationTest.java
@@ -21,7 +21,6 @@ package org.apache.maven.it;
import org.apache.maven.it.Verifier;
import org.apache.maven.it.util.ResourceExtractor;
-import org.apache.maven.it.util.Os;
import java.io.File;
import java.util.Properties;
diff --git a/its/core-it-suite/src/test/resources/mng-3933/pom.xml b/its/core-it-suite/src/test/resources/mng-3933/pom.xml
new file mode 100644
index 0000000000..e6734d5171
--- /dev/null
+++ b/its/core-it-suite/src/test/resources/mng-3933/pom.xml
@@ -0,0 +1,57 @@
+
+
+
+
+
+ 4.0.0
+
+ org.apache.maven.its.mng3933
+ test1
+ 1.0-SNAPSHOT
+
+ Maven Integration Test :: MNG-3933
+
+ Test that OS-triggered profiles from an external profiles.xml are activated.
+
+
+
+
+
+ org.apache.maven.its.plugins
+ maven-it-plugin-expression
+ 2.1-SNAPSHOT
+
+
+ validate
+
+ eval
+
+
+ target/profile.properties
+
+ project/properties
+
+
+
+
+
+
+
+
diff --git a/its/core-it-suite/src/test/resources/mng-3933/profiles.xml b/its/core-it-suite/src/test/resources/mng-3933/profiles.xml
new file mode 100644
index 0000000000..796a5f89cf
--- /dev/null
+++ b/its/core-it-suite/src/test/resources/mng-3933/profiles.xml
@@ -0,0 +1,56 @@
+
+
+
+
+
+
+ PROFILE-A
+
+
+ winDOWS
+
+
+
+ PASSED
+
+
+
+ PROFILE-B
+
+
+ unIX
+
+
+
+ PASSED
+
+
+
+ PROFILE-C
+
+
+ mAC
+
+
+
+ PASSED
+
+
+