diff --git a/platform/platform-impl/src/com/intellij/platform/PlatformProjectOpenProcessor.java b/platform/platform-impl/src/com/intellij/platform/PlatformProjectOpenProcessor.java
index a3e40233cf08..e5b14e20d265 100644
--- a/platform/platform-impl/src/com/intellij/platform/PlatformProjectOpenProcessor.java
+++ b/platform/platform-impl/src/com/intellij/platform/PlatformProjectOpenProcessor.java
@@ -72,7 +72,7 @@ public class PlatformProjectOpenProcessor extends ProjectOpenProcessor {
   }
 
   @Nullable
-  public Project doOpenProject(@NotNull final VirtualFile virtualFile, final Project projectToClose, final boolean forceOpenInNewFrame) {
+  public Project doOpenProject(@NotNull final VirtualFile virtualFile, @Nullable final Project projectToClose, final boolean forceOpenInNewFrame) {
     return doOpenProject(virtualFile, projectToClose, forceOpenInNewFrame, -1);
   }