diff --git a/gdk/gdkcairo.c b/gdk/gdkcairo.c
index c423871fbc..2ad77d1ea9 100644
--- a/gdk/gdkcairo.c
+++ b/gdk/gdkcairo.c
@@ -247,7 +247,7 @@ gdk_cairo_set_source_pixbuf (cairo_t         *cr,
 	  guchar *end = p + 4 * width;
 	  guint t1,t2,t3;
 	    
-#define MULT(d,c,a,t) G_STMT_START { t = c * a + 0x7f; d = ((t >> 8) + t) >> 8; } G_STMT_END
+#define MULT(d,c,a,t) G_STMT_START { t = c * a + 0x80; d = ((t >> 8) + t) >> 8; } G_STMT_END
 
 	  while (p < end)
 	    {