diff --git a/ggplot2.Rproj b/ggplot2.Rproj
index 30db3b443..957e868bf 100644
--- a/ggplot2.Rproj
+++ b/ggplot2.Rproj
@@ -3,6 +3,7 @@ Version: 1.0
 RestoreWorkspace: Default
 SaveWorkspace: Default
 AlwaysSaveHistory: Default
+QuitChildProcessesOnExit: Default
 
 EnableCodeIndexing: Yes
 UseSpacesForTab: Yes