--- a/taskcluster/ci/toolchain/linux.yml
+++ b/taskcluster/ci/toolchain/linux.yml
@@ -139,17 +139,17 @@ linux64-gcc-6:
     description: "GCC 6 toolchain build"
     treeherder:
         kind: build
         platform: toolchains/opt
         symbol: TL(gcc6)
         tier: 1
     worker-type: aws-provisioner-v1/gecko-{level}-b-linux
     worker:
-        docker-image: {in-tree: desktop-build}
+        docker-image: {in-tree: toolchain-build}
         max-run-time: 36000
     run:
         using: toolchain-script
         script: build-gcc-6-linux.sh
         resources:
             - 'build/unix/build-gcc/build-gcc.sh'
         toolchain-alias: linux64-gcc
         toolchain-artifact: public/build/gcc.tar.xz