diff --git a/installation/mods_Abaqus/abaqus_v6.env b/installation/mods_Abaqus/abaqus_v6.env
index b04c25036..2c05cc753 100644
--- a/installation/mods_Abaqus/abaqus_v6.env
+++ b/installation/mods_Abaqus/abaqus_v6.env
@@ -30,7 +30,7 @@ fortCmd = "ifort"
 # -integer-size 32 -DINT=4     assume size of integer to be 4 bytes, matches our definition of pInt
 
 compile_fortran = (fortCmd + " -c -fPIC -auto " + 
-                   "-I%I -free -O2 -fpp -openmp " +
+                   "-I%I -free -O1 -fpp -openmp " +
                    "-ftz " +
                    "-implicitnone -assume byterecl " +
                    "-real-size 64 -integer-size 32 -DFLOAT=8 -DINT=4")