diff --git a/pkgs/kde/plasma/ksystemstats/default.nix b/pkgs/kde/plasma/ksystemstats/default.nix
index 5582de47cb9f..75e6d22f223e 100644
--- a/pkgs/kde/plasma/ksystemstats/default.nix
+++ b/pkgs/kde/plasma/ksystemstats/default.nix
@@ -16,7 +16,7 @@ mkKdeDerivation {
     libnl
   ];
 
-  cmakeFlags = [
+  extraCmakeFlags = [
     "-DSYSTEMSTATS_DBUS_INTERFACE=${libksysguard}/share/dbus-1/interfaces/org.kde.ksystemstats1.xml"
   ];
 }