diff --git a/system/desktop.nix b/system/desktop.nix
index fd9c8b85..3ec56d39 100644
--- a/system/desktop.nix
+++ b/system/desktop.nix
@@ -182,7 +182,7 @@
             save_filename_format=swappy-%Y%m%d-%H%M%S.png
             show_panel=false
             line_size=5
-            text_size=${config.stylix.fonts.sizes.desktop}
+            text_size=${toString config.stylix.fonts.sizes.desktop}
             text_font=${config.stylix.fonts.sansSerif.name}
             paint_mode=brush
             early_exit=false