diff --git a/buildconfig/Jenkins/buildscript b/buildconfig/Jenkins/buildscript
index 2df15774b565f72d8e5a077ff7c82984c711a7a7..8a3a43adc7c6c43b38d464b241a66bda6f196eaa 100755
--- a/buildconfig/Jenkins/buildscript
+++ b/buildconfig/Jenkins/buildscript
@@ -391,14 +391,15 @@ fi
 # Prevent race conditions when creating the user config directory
 userconfig_dir=$HOME/.mantid
 rm -fr $userconfig_dir
-# Remove GUI qsettings files
+# Remove old application saved state & crash reports on mac.
+# If we don't do this then when a previous test has crashed macOS
+# will pop up a dialog box and wait for clicking okay. We are heavy
+# handed but builders tend not to be used for anything else.
 if [[ ${ON_MACOS} == true ]] ; then
-    rm -f $HOME/Library/Preferences/com.mantid.MantidPlot.plist
-    rm -f $HOME/Library/Preferences/org.mantidproject.MantidPlot.plist
-    rm -f "$HOME/Library/Saved Application State/org.mantidproject.MantidPlot.savedState/windows.plist"
-else
-    rm -f ~/.config/Mantid/MantidPlot.conf
+    rm -fr "$HOME/Library/Saved Application State/org.python.python"
+    rm -f $HOME/Library/Application\ Support/CrashReporter/*
 fi
+# Remove GUI qsettings files
 rm -f ~/.config/mantidproject/mantidworkbench.ini
 
 mkdir -p $userconfig_dir