diff --git a/acl/src/main/java/org/springframework/security/acls/jdbc/BasicLookupStrategy.java b/acl/src/main/java/org/springframework/security/acls/jdbc/BasicLookupStrategy.java
index ce8178f6e6..36db5ea663 100644
--- a/acl/src/main/java/org/springframework/security/acls/jdbc/BasicLookupStrategy.java
+++ b/acl/src/main/java/org/springframework/security/acls/jdbc/BasicLookupStrategy.java
@@ -660,7 +660,7 @@ public class BasicLookupStrategy implements LookupStrategy {
 		}
 	}
 
-	private class StubAclParent implements Acl {
+	private static class StubAclParent implements Acl {
 		private final Long id;
 
 		public StubAclParent(Long id) {
diff --git a/config/src/main/java/org/springframework/security/config/annotation/web/messaging/MessageSecurityMetadataSourceRegistry.java b/config/src/main/java/org/springframework/security/config/annotation/web/messaging/MessageSecurityMetadataSourceRegistry.java
index 894e98fbc7..4242b5c9d3 100644
--- a/config/src/main/java/org/springframework/security/config/annotation/web/messaging/MessageSecurityMetadataSourceRegistry.java
+++ b/config/src/main/java/org/springframework/security/config/annotation/web/messaging/MessageSecurityMetadataSourceRegistry.java
@@ -410,7 +410,7 @@ public class MessageSecurityMetadataSourceRegistry {
 		return "hasAnyAuthority('" + anyAuthorities + "')";
 	}
 
-	private class PreBuiltMatcherBuilder implements MatcherBuilder {
+	private static class PreBuiltMatcherBuilder implements MatcherBuilder {
 		private MessageMatcher<?> matcher;
 
 		private PreBuiltMatcherBuilder(MessageMatcher<?> matcher) {
diff --git a/config/src/main/java/org/springframework/security/config/annotation/web/socket/AbstractSecurityWebSocketMessageBrokerConfigurer.java b/config/src/main/java/org/springframework/security/config/annotation/web/socket/AbstractSecurityWebSocketMessageBrokerConfigurer.java
index 1646ca4a12..2bb5e42582 100644
--- a/config/src/main/java/org/springframework/security/config/annotation/web/socket/AbstractSecurityWebSocketMessageBrokerConfigurer.java
+++ b/config/src/main/java/org/springframework/security/config/annotation/web/socket/AbstractSecurityWebSocketMessageBrokerConfigurer.java
@@ -170,7 +170,7 @@ public abstract class AbstractSecurityWebSocketMessageBrokerConfigurer extends
 	protected void configureInbound(MessageSecurityMetadataSourceRegistry messages) {
 	}
 
-	private class WebSocketMessageSecurityMetadataSourceRegistry extends
+	private static class WebSocketMessageSecurityMetadataSourceRegistry extends
 			MessageSecurityMetadataSourceRegistry {
 		@Override
 		public MessageSecurityMetadataSource createMetadataSource() {
diff --git a/core/src/main/java/org/springframework/security/access/method/MapBasedMethodSecurityMetadataSource.java b/core/src/main/java/org/springframework/security/access/method/MapBasedMethodSecurityMetadataSource.java
index 5e49f33319..0751f94bb3 100644
--- a/core/src/main/java/org/springframework/security/access/method/MapBasedMethodSecurityMetadataSource.java
+++ b/core/src/main/java/org/springframework/security/access/method/MapBasedMethodSecurityMetadataSource.java
@@ -279,7 +279,7 @@ public class MapBasedMethodSecurityMetadataSource extends
 	 * inherits but does not redeclare a method, the registered Class will be the Class
 	 * we're invoking against and the Method will provide details of the declared class.
 	 */
-	private class RegisteredMethod {
+	private static class RegisteredMethod {
 		private final Method method;
 		private final Class<?> registeredJavaType;
 
diff --git a/web/src/main/java/org/springframework/security/web/FilterChainProxy.java b/web/src/main/java/org/springframework/security/web/FilterChainProxy.java
index 19ffa9941f..b3345730d4 100644
--- a/web/src/main/java/org/springframework/security/web/FilterChainProxy.java
+++ b/web/src/main/java/org/springframework/security/web/FilterChainProxy.java
@@ -336,7 +336,7 @@ public class FilterChainProxy extends GenericFilterBean {
 		void validate(FilterChainProxy filterChainProxy);
 	}
 
-	private class NullFilterChainValidator implements FilterChainValidator {
+	private static class NullFilterChainValidator implements FilterChainValidator {
 		public void validate(FilterChainProxy filterChainProxy) {
 		}
 	}