diff --git a/scm-webapp/src/main/java/sonia/scm/resources/DefaultResourceManager.java b/scm-webapp/src/main/java/sonia/scm/resources/DefaultResourceManager.java
index be35c8c663..dc0ae0f934 100644
--- a/scm-webapp/src/main/java/sonia/scm/resources/DefaultResourceManager.java
+++ b/scm-webapp/src/main/java/sonia/scm/resources/DefaultResourceManager.java
@@ -34,6 +34,7 @@ package sonia.scm.resources;
 //~--- non-JDK imports --------------------------------------------------------
 
 import com.google.inject.Inject;
+import com.google.inject.Singleton;
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -55,6 +56,7 @@ import javax.servlet.ServletContext;
  *
  * @author Sebastian Sdorra
  */
+@Singleton
 public class DefaultResourceManager extends AbstractResourceManager
 {
 
diff --git a/scm-webapp/src/main/java/sonia/scm/resources/DevelopmentResourceManager.java b/scm-webapp/src/main/java/sonia/scm/resources/DevelopmentResourceManager.java
index f1e62da46e..4e1364c61d 100644
--- a/scm-webapp/src/main/java/sonia/scm/resources/DevelopmentResourceManager.java
+++ b/scm-webapp/src/main/java/sonia/scm/resources/DevelopmentResourceManager.java
@@ -34,6 +34,7 @@ package sonia.scm.resources;
 //~--- non-JDK imports --------------------------------------------------------
 
 import com.google.inject.Inject;
+import com.google.inject.Singleton;
 
 import sonia.scm.plugin.PluginLoader;
 
@@ -51,6 +52,7 @@ import javax.servlet.ServletContext;
  *
  * @author Sebastian Sdorra
  */
+@Singleton
 public class DevelopmentResourceManager extends AbstractResourceManager
 {