diff --git a/src/cairo-ps-surface.c b/src/cairo-ps-surface.c
index 271fe2de2..5eade854a 100644
--- a/src/cairo-ps-surface.c
+++ b/src/cairo-ps-surface.c
@@ -654,7 +654,8 @@ _cairo_ps_surface_emit_type3_font_subset (cairo_ps_surface_t		*surface,
     cairo_status_t status;
     cairo_matrix_t matrix;
     unsigned int i;
-    cairo_box_t font_bbox, bbox;
+    cairo_box_t font_bbox = {{0,0},{0,0}};
+    cairo_box_t bbox = {{0,0},{0,0}};
 
     _cairo_output_stream_printf (surface->final_stream,
 				 "%% _cairo_ps_surface_emit_type3_font_subset\n");