diff --git a/povray_gcc/build_with_docker.sh b/povray_gcc/build_with_docker.sh
index 47e4c6a..1b55570 100644
--- a/povray_gcc/build_with_docker.sh
+++ b/povray_gcc/build_with_docker.sh
@@ -13,7 +13,7 @@ sudo docker build . -t povray_gcc
 cd povray
 
 sudo docker run \
-  -cpus=2 \
+  --cpus=2 \
   -v $PWD:/usr/src \
   povray_gcc \
   sh -c 'cd /usr/src && sh build.sh'
\ No newline at end of file