diff --git a/basctl/source/basicide/doceventnotifier.cxx b/basctl/source/basicide/doceventnotifier.cxx
index 254c719bb5cc..9d408d7f967a 100644
--- a/basctl/source/basicide/doceventnotifier.cxx
+++ b/basctl/source/basicide/doceventnotifier.cxx
@@ -109,6 +109,7 @@ namespace basctl
         if ( !impl_isDisposed_nothrow(aGuard) )
         {
             acquire();
+            aGuard.unlock(); // dispose locks m_aMutex
             dispose();
         }
     }