diff --git a/src/const.h b/src/const.h
index 0487da30ccbd4fb7951de62a388c917b1d5510f3..50d72e3339d7b8f04e3028f09794aff45f03dc65 100644
--- a/src/const.h
+++ b/src/const.h
@@ -59,9 +59,9 @@
 #define GADGET2_SPH
 //#define DEFAULT_SPH
 
-/* Gravity properties */
-/* #define EXTERNAL_POTENTIAL_POINTMASS */
-#define EXTERNAL_POTENTIAL_ISOTHERMALPOTENTIAL
+/* External potential properties */
+#define EXTERNAL_POTENTIAL_POINTMASS
+//#define EXTERNAL_POTENTIAL_ISOTHERMALPOTENTIAL
 
 /* Are we debugging ? */
 //#define SWIFT_DEBUG_CHECKS