diff --git a/p2-maven-plugin/src/main/java/org/eclipse/tycho/p2maven/transport/RemoteArtifactRepositoryManager.java b/p2-maven-plugin/src/main/java/org/eclipse/tycho/p2maven/transport/RemoteArtifactRepositoryManager.java
index 0f4ebb9c6e..c37c3c46c6 100644
--- a/p2-maven-plugin/src/main/java/org/eclipse/tycho/p2maven/transport/RemoteArtifactRepositoryManager.java
+++ b/p2-maven-plugin/src/main/java/org/eclipse/tycho/p2maven/transport/RemoteArtifactRepositoryManager.java
@@ -71,7 +71,11 @@ public IArtifactRequest createMirrorRequest(IArtifactKey key, IArtifactRepositor
     @Override
     public IArtifactRepository createRepository(URI location, String name, String type, Map<String, String> properties)
             throws ProvisionException {
-        return delegate.createRepository(translate(location), name, type, properties);
+		synchronized (RemoteArtifactRepositoryManager.class) {
+			// TODO the sync is required unless
+			// https://github.com/eclipse-equinox/p2/pull/415 is fixed
+			return delegate.createRepository(translate(location), name, type, properties);
+		}
     }
 
     @Override