diff --git a/pkgs/os-specific/linux/kernel/common-config.nix b/pkgs/os-specific/linux/kernel/common-config.nix
index a972c4e60f89..cb7423f293a4 100644
--- a/pkgs/os-specific/linux/kernel/common-config.nix
+++ b/pkgs/os-specific/linux/kernel/common-config.nix
@@ -396,7 +396,7 @@ with stdenv.lib;
     KVM_CLOCK? y
   ''}
   ${optionalString (versionAtLeast version "4.0") ''
-    KVM_COMPAT y
+    KVM_COMPAT? y
   ''}
   ${optionalString (versionAtLeast version "3.10") ''
     KVM_DEVICE_ASSIGNMENT? y