diff --git a/src/apprt/gtk/class/surface.zig b/src/apprt/gtk/class/surface.zig
index 59d8ed0f7..9d45bc6ce 100644
--- a/src/apprt/gtk/class/surface.zig
+++ b/src/apprt/gtk/class/surface.zig
@@ -1577,7 +1577,11 @@ pub const Surface = extern struct {
             // https://gitlab.gnome.org/GNOME/libadwaita/-/commit/a7738a4d269bfdf4d8d5429ca73ccdd9b2450421
             // https://gitlab.gnome.org/GNOME/libadwaita/-/commit/9759d3fd81129608dd78116001928f2aed974ead
             if (gtk_xft_dpi <= 0) {
-                log.warn("gtk-xft-dpi has invalid value ({}), using default", .{gtk_xft_dpi});
+                // -1 is a valid value which specifies default scale.
+                // https://docs.gtk.org/gtk4/property.Settings.gtk-xft-dpi.html
+                if (gtk_xft_dpi != -1) {
+                    log.warn("gtk-xft-dpi has invalid value ({}), using default", .{gtk_xft_dpi});
+                }
                 break :xft_scale 1.0;
             }