diff --git a/org.eclipse.ui.intro.universal/src/org/eclipse/ui/internal/intro/universal/CustomizationContentsArea.java b/org.eclipse.ui.intro.universal/src/org/eclipse/ui/internal/intro/universal/CustomizationContentsArea.java
index 73b66c7..1715ef1 100644
--- a/org.eclipse.ui.intro.universal/src/org/eclipse/ui/internal/intro/universal/CustomizationContentsArea.java
+++ b/org.eclipse.ui.intro.universal/src/org/eclipse/ui/internal/intro/universal/CustomizationContentsArea.java
@@ -383,7 +383,7 @@
 		}
 	}
 
-	class IntroTheme {
+	static class IntroTheme {
 		IConfigurationElement element;
 		Image previewImage;
 
diff --git a/org.eclipse.ui.intro/src/org/eclipse/ui/internal/intro/impl/model/History.java b/org.eclipse.ui.intro/src/org/eclipse/ui/internal/intro/impl/model/History.java
index d66c7e9..4666d60 100644
--- a/org.eclipse.ui.intro/src/org/eclipse/ui/internal/intro/impl/model/History.java
+++ b/org.eclipse.ui.intro/src/org/eclipse/ui/internal/intro/impl/model/History.java
@@ -35,7 +35,7 @@
 	// IFrame is stored in history as a different object with the IFrameURL set.
 	// This way the model actually creates one page for every embedded Help
 	// Topic target but the navigation history updates the IFrame accordingly.
-	class HistoryObject {
+	static class HistoryObject {
 		AbstractIntroPage page;
 		String iframeUrl;
 		String url;
diff --git a/org.eclipse.ui.intro/src/org/eclipse/ui/internal/intro/impl/model/IntroSearchParticipant.java b/org.eclipse.ui.intro/src/org/eclipse/ui/internal/intro/impl/model/IntroSearchParticipant.java
index 824b7c9..a1da253 100644
--- a/org.eclipse.ui.intro/src/org/eclipse/ui/internal/intro/impl/model/IntroSearchParticipant.java
+++ b/org.eclipse.ui.intro/src/org/eclipse/ui/internal/intro/impl/model/IntroSearchParticipant.java
@@ -44,7 +44,7 @@
 
 	private IntroModelRoot model;
 
-	private class TitleAndSummary {
+	private static class TitleAndSummary {
 		String title;
 		String summary;
 	}
diff --git a/org.eclipse.ui.intro/src/org/eclipse/ui/internal/intro/impl/model/loader/ContentProviderManager.java b/org.eclipse.ui.intro/src/org/eclipse/ui/internal/intro/impl/model/loader/ContentProviderManager.java
index 56bb898..3d0d044 100644
--- a/org.eclipse.ui.intro/src/org/eclipse/ui/internal/intro/impl/model/loader/ContentProviderManager.java
+++ b/org.eclipse.ui.intro/src/org/eclipse/ui/internal/intro/impl/model/loader/ContentProviderManager.java
@@ -54,7 +54,7 @@
 	private Map<String, ContentProviderWrapper> contentProviders = new HashMap<>();
 
 
-	class ContentProviderWrapper {
+	static class ContentProviderWrapper {
 
 		IIntroContentProvider provider;
 		AbstractIntroPage parentPage;
diff --git a/org.eclipse.ui.intro/src/org/eclipse/ui/internal/intro/impl/swt/RootPageForm.java b/org.eclipse.ui.intro/src/org/eclipse/ui/internal/intro/impl/swt/RootPageForm.java
index 683360d..d9ac57e 100644
--- a/org.eclipse.ui.intro/src/org/eclipse/ui/internal/intro/impl/swt/RootPageForm.java
+++ b/org.eclipse.ui.intro/src/org/eclipse/ui/internal/intro/impl/swt/RootPageForm.java
@@ -75,7 +75,7 @@
 		}
 	}
 
-	class RootPageLayout extends Layout {
+	static class RootPageLayout extends Layout {
 
 		// gap between link composite and description label.
 		private int VERTICAL_SPACING = 20;