diff --git a/hosts/c3d2-web/default.nix b/hosts/c3d2-web/default.nix
index 6ced745a..91afb568 100644
--- a/hosts/c3d2-web/default.nix
+++ b/hosts/c3d2-web/default.nix
@@ -3,7 +3,16 @@
 {
   microvm = {
     vcpu = 4;
-    mem = 2 * 1024; # drone-ssh-runner clones the git repo which requires some RAM
+    # drone-ssh-runner clones the git repo into tmpfs which requires
+    # some RAM
+    mem = 2 * 1024;
+  };
+
+  # drone-ssh-runner clones into /tmp which needs to be bigger than
+  # the default rootfs tmpfs
+  boot.tmp = {
+    useTmpfs = true;
+    tmpfsSize = "80%";
   };
 
   c3d2.deployment = {