diff --git a/Testing/SystemTests/tests/analysis/ISIS_WISHSingleCrystalReduction.py b/Testing/SystemTests/tests/analysis/ISIS_WISHSingleCrystalReduction.py
index 53ae046ce81e2b5f633fbd0d1976890e083f7c2a..586c46972b213d8e8b7b548390f05371f17c5c86 100644
--- a/Testing/SystemTests/tests/analysis/ISIS_WISHSingleCrystalReduction.py
+++ b/Testing/SystemTests/tests/analysis/ISIS_WISHSingleCrystalReduction.py
@@ -29,7 +29,7 @@ class WISHSingleCrystalPeakPredictionTest(MantidSystemTest):
 
     def requiredMemoryMB(self):
         # Need lots of memory for full WISH dataset
-        return 16000
+        return 24000
 
     def cleanup(self):
         try: