diff --git a/Makefile b/Makefile
index ca70079..7d3d8fb 100644
--- a/Makefile
+++ b/Makefile
@@ -14,7 +14,7 @@ vpath %.f src
 
 # Fortran compiler name and flags
 FC=gfortran
-FFLAGS=-O3 #-Wall -g -fcheck=all
+FFLAGS=-Wall -g -fcheck=all
 
 DIRECTIVES = -DREVISION="'$(shell svnversion src)'"