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-rw-r--r--pkgs/build-support/vm/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/build-support/vm/default.nix b/pkgs/build-support/vm/default.nix
index 66998b341309..987da5585195 100644
--- a/pkgs/build-support/vm/default.nix
+++ b/pkgs/build-support/vm/default.nix
@@ -291,7 +291,7 @@ rec {
     args = ["-e" (vmRunCommand qemuCommandLinux)];
     origArgs = attrs.args;
     origBuilder = attrs.builder;
-    QEMU_OPTS = "-m ${toString (if attrs ? memSize then attrs.memSize else 512)}";
+    QEMU_OPTS = "-m ${toString (attrs.memSize or 512)}";
   });