diff --git a/code/makefile b/code/makefile
index 6255100..9b074bc 100644
--- a/code/makefile
+++ b/code/makefile
@@ -8,16 +8,18 @@ BLOCKSIZE?=32
 
 TERMSPEC?=code_gen/terms.input
 
-flags = -cpp -DBLOCKSIZE=$(BLOCKSIZE) -Wall -O3 -ffree-line-length-0 -fdefault-integer-8 -fdefault-double-8 -fdefault-real-8 -march=native
-
 ifdef CHECK
 flags += -fcheck=all
 endif
 
 ifdef DEBUG
 flags += -g
+else
+flags += -O3
 endif
 
+flags += -cpp -DBLOCKSIZE=$(BLOCKSIZE) -Wall -ffree-line-length-0 -fdefault-integer-8 -fdefault-double-8 -fdefault-real-8 -march=native
+
 compiler = mpif90