diff --git a/drivers/gpu/drm/nouveau/nv17_tv.c b/drivers/gpu/drm/nouveau/nv17_tv.c
index a9a33e9..24efd11 100644
--- a/drivers/gpu/drm/nouveau/nv17_tv.c
+++ b/drivers/gpu/drm/nouveau/nv17_tv.c
@@ -178,13 +178,11 @@ static int nv17_tv_mode_valid(struct drm_encoder *encoder,
 			return MODE_NO_DBLESCAN;
 
 	} else {
-		const int vsync_tolerance = 10;
-
 		if (mode->clock > 70000)
 			return MODE_CLOCK_HIGH;
 
-		if (abs(drm_mode_vrefresh(mode) -
-			    tv_norm->tv_enc_mode.vrefresh) > vsync_tolerance)
+		if (drm_mode_vrefresh(mode) -
+		    tv_norm->tv_enc_mode.vrefresh/1000)
 			return MODE_VSYNC;
 
 		/* The encoder takes care of the actual interlacing */