diff --git a/Make.Microphysics b/Make.Microphysics
index 03748d255..c84ca5cb7 100644
--- a/Make.Microphysics
+++ b/Make.Microphysics
@@ -59,10 +59,6 @@ ifeq ($(USE_COMPILE_WITH_F2PY), TRUE)
 	sh dof2py.sh
 endif
 
-# Use a coarse grained OMP approach
-DEFINES += -DCRSEGRNDOMP
-
-
 # OpenACC support
 ifeq ($(USE_ACC), TRUE)
   DEFINES += -DACC