diff --git a/drivers/video/fbdev/aty/atyfb_base.c b/drivers/video/fbdev/aty/atyfb_base.c
index b55fdac9c9f51a..43da26cdf670d1 100644
--- a/drivers/video/fbdev/aty/atyfb_base.c
+++ b/drivers/video/fbdev/aty/atyfb_base.c
@@ -1857,6 +1857,9 @@ static int atyfb_ioctl(struct fb_info *info, u_int cmd, u_long arg)
 		if (M64_HAS(INTEGRATED)) {
 			struct atyclk clk;
 			union aty_pll *pll = &par->pll;
+			
+			memset( &clk, 0, sizeof(struct atyclk) );
+			
 			u32 dsp_config = pll->ct.dsp_config;
 			u32 dsp_on_off = pll->ct.dsp_on_off;
 			clk.ref_clk_per = par->ref_clk_per;