diff --git a/src/main/java/org/apache/maven/plugins/install/InstallMojo.java b/src/main/java/org/apache/maven/plugins/install/InstallMojo.java
index e4f098a5..080bafa5 100644
--- a/src/main/java/org/apache/maven/plugins/install/InstallMojo.java
+++ b/src/main/java/org/apache/maven/plugins/install/InstallMojo.java
@@ -20,11 +20,8 @@
  */
 
 import java.io.IOException;
-import java.util.Collections;
-import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
-import java.util.concurrent.ConcurrentMap;
 
 import org.apache.maven.execution.MavenSession;
 import org.apache.maven.plugin.MojoExecutionException;
@@ -50,9 +47,7 @@
 public class InstallMojo
     extends AbstractInstallMojo
 {
-    private static final String INSTALL_REQUESTS_KEY = InstallMojo.class.getName() + ".installRequests";
-
-    private static final MavenProject SENTINEL = new MavenProject();
+    private static final String INSTALL_PROCESSED_MARKER = InstallMojo.class.getName() + ".processed";
 
     @Parameter( defaultValue = "${project}", readonly = true, required = true )
     private MavenProject project;
@@ -93,17 +88,10 @@ public void execute()
     {
 
         final String projectKey = project.getGroupId() + ":" + project.getArtifactId() + ":" + project.getVersion();
-        final ConcurrentMap<String, Object> pluginContext =
-                (ConcurrentMap<String, Object>) session.getPluginContext( pluginDescriptor, reactorProjects.get( 0 ) );
-        final Map<String, MavenProject> installRequests = (Map<String, MavenProject>) pluginContext.computeIfAbsent(
-                INSTALL_REQUESTS_KEY,
-                k -> Collections.synchronizedMap( new LinkedHashMap<String, MavenProject>() )
-        );
-
         boolean addedInstallRequest = false;
         if ( skip )
         {
-            installRequests.put( projectKey, SENTINEL );
+            getPluginContext().put( INSTALL_PROCESSED_MARKER, Boolean.FALSE );
             getLog().info( "Skipping artifact installation" );
         }
         else
@@ -114,22 +102,24 @@ public void execute()
             }
             else
             {
-                installRequests.put( projectKey, project );
+                getPluginContext().put( INSTALL_PROCESSED_MARKER, Boolean.TRUE );
                 addedInstallRequest = true;
             }
         }
 
-        if ( installRequests.size() == reactorProjects.size() )
+        if ( allProjectsMarked() )
         {
-            for ( Map.Entry<String, MavenProject> projectEntry : installRequests.entrySet() )
+            for ( MavenProject reactorProject : reactorProjects )
             {
-                if ( projectEntry.getValue() == SENTINEL )
+                Map<String, Object> pluginContext = session.getPluginContext( pluginDescriptor, reactorProject );
+                Boolean install = (Boolean) pluginContext.get( INSTALL_PROCESSED_MARKER );
+                if ( !install )
                 {
                     getLog().info( "Project " + projectKey + " skipped install" );
                 }
                 else
                 {
-                    installProject( projectEntry.getValue() );
+                    installProject( reactorProject );
                 }
             }
         }
@@ -139,6 +129,19 @@ else if ( addedInstallRequest )
         }
     }
 
+    private boolean allProjectsMarked()
+    {
+        for ( MavenProject reactorProject : reactorProjects )
+        {
+            Map<String, Object> pluginContext = session.getPluginContext( pluginDescriptor, reactorProject );
+            if ( !pluginContext.containsKey( INSTALL_PROCESSED_MARKER ) )
+            {
+                return false;
+            }
+        }
+        return true;
+    }
+
     private void installProject( MavenProject pir )
         throws MojoFailureException, MojoExecutionException
     {
diff --git a/src/test/java/org/apache/maven/plugins/install/InstallMojoTest.java b/src/test/java/org/apache/maven/plugins/install/InstallMojoTest.java
index 5d0ed3c7..6abd82bf 100644
--- a/src/test/java/org/apache/maven/plugins/install/InstallMojoTest.java
+++ b/src/test/java/org/apache/maven/plugins/install/InstallMojoTest.java
@@ -325,6 +325,7 @@ public void testSkip()
         MavenProject project = (MavenProject) getVariableValueFromObject( mojo, "project" );
         updateMavenProject( project );
 
+        setVariableValueToObject( mojo, "pluginContext", new ConcurrentHashMap<>() );
         setVariableValueToObject( mojo, "pluginDescriptor", new PluginDescriptor() );
         setVariableValueToObject( mojo, "reactorProjects", Collections.singletonList( project ) );
         setVariableValueToObject( mojo, "session", createMavenSession() );