diff --git a/nix/testground-image.nix b/nix/testground-image.nix
index 9058412f33..5644a3f78c 100644
--- a/nix/testground-image.nix
+++ b/nix/testground-image.nix
@@ -1,4 +1,4 @@
-{ dockerTools, cronos-matrix, testground-testcase }:
+{ dockerTools, runCommandLocal, cronos-matrix, testground-testcase }:
 let
   patched-cronosd = cronos-matrix.cronosd.overrideAttrs (oldAttrs: {
     patches = oldAttrs.patches or [ ] ++ [
@@ -6,12 +6,18 @@ let
     ];
   });
 in
+let
+  tmpDir = runCommandLocal "tmp" { } ''
+    mkdir -p $out/tmp/
+  '';
+in
 dockerTools.buildLayeredImage {
   name = "cronos-testground";
   created = "now";
   contents = [
     testground-testcase
     patched-cronosd
+    tmpDir
   ];
   config = {
     Expose = [ 9090 26657 26656 1317 26658 26660 26659 30000 ];
diff --git a/testground/benchmark/compositions/docker-compose.jsonnet b/testground/benchmark/compositions/docker-compose.jsonnet
index bec5e017f7..e3879941d8 100644
--- a/testground/benchmark/compositions/docker-compose.jsonnet
+++ b/testground/benchmark/compositions/docker-compose.jsonnet
@@ -6,7 +6,6 @@ std.manifestYamlDoc({
       container_name: 'testplan-' + i,
       volumes: [
         @'${DATADIR:-/tmp/data/out}:/data',
-        '/tmp:/tmp',
       ],
       environment: {
         JOB_COMPLETION_INDEX: i,