diff --git a/docker/Dockerfile b/docker/Dockerfile
index 496c2ee8..ff541ec9 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -25,7 +25,7 @@ WORKDIR /root/swak4Foam
 RUN /bin/bash -c 'shopt -s expand_aliases && ./maintainanceScripts/compileRequirements.sh'
 
 WORKDIR /root/swak4Foam
-RUN /bin/bash -c 'shopt -s expand_aliases && source /openfoam/bash.rc && export FOAM_USER_LIBBIN=$FOAM_SITE_LIBBIN && export FOAM_USER_APPBIN=$FOAM_SITE_APPBIN && export SWAK_COMPILE_GRAMMAR_OPTION=-1 && export WM_NCOMPPROCS=1 && ./Allwmake'
+RUN /bin/bash -c 'shopt -s expand_aliases && source /openfoam/bash.rc && export FOAM_USER_LIBBIN=$FOAM_SITE_LIBBIN && export FOAM_USER_APPBIN=$FOAM_SITE_APPBIN && export SWAK_COMPILE_GRAMMAR_OPTION=-O1 && export WM_NCOMPPROCS=1 && ./Allwmake'
 
 WORKDIR /root/sedfoam
 RUN /bin/bash -c 'shopt -s expand_aliases && source /openfoam/bash.rc && export FOAM_USER_LIBBIN=$FOAM_SITE_LIBBIN && ./Allwmake -prefix=group'