diff --git a/gtk/gtkthemingengine.c b/gtk/gtkthemingengine.c
index 775fd6ba20..b38059bab0 100644
--- a/gtk/gtkthemingengine.c
+++ b/gtk/gtkthemingengine.c
@@ -2058,10 +2058,9 @@ gtk_theming_engine_render_frame_gap (GtkThemingEngine *engine,
   GtkStateFlags state;
   gint border_width;
   GtkCssValue *corner[4];
-  gdouble x0, y0, x1, y1, xc, yc, wc, hc;
+  gdouble x0, y0, x1, y1, xc = 0.0, yc = 0.0, wc = 0.0, hc = 0.0;
   GtkBorder border;
 
-  xc = yc = wc = hc = 0;
   state = gtk_theming_engine_get_state (engine);
   junction = gtk_theming_engine_get_junction_sides (engine);