diff --git a/.circleci/config.yml b/.circleci/config.yml
index 0363d6472cfa..5ef481e1ae8e 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -4,7 +4,7 @@ jobs:
     working_directory: ~/dmd
     docker:
       - image: circleci/node:4.8.2
-    parallelism: 1
+    parallelism: 2
     steps:
       - checkout
       - run:
diff --git a/.circleci/run.sh b/.circleci/run.sh
index 09f6c58e0e09..73b99ebe574f 100755
--- a/.circleci/run.sh
+++ b/.circleci/run.sh
@@ -23,7 +23,10 @@ case "${CIRCLE_STAGE}" in
         ;;
     no_pic)
         PIC=0
-        MODEL=32
+        case $CIRCLE_NODE_INDEX in
+            0) MODEL=64 ;;
+            1) MODEL=32 ;;
+        esac
 esac
 
 # clone druntime and phobos