diff --git a/src/i810_reg.h b/src/i810_reg.h
index 102097cd..59b60793 100644
--- a/src/i810_reg.h
+++ b/src/i810_reg.h
@@ -2443,7 +2443,7 @@ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #define MI_WAIT_FOR_PIPEB_VBLANK		(1<<7)
 #define MI_WAIT_FOR_PIPEB_SCAN_LINE_WINDOW	(1<<5)
 #define MI_WAIT_FOR_PIPEA_VBLANK		(1<<3)
-#define MI_WAIT_FOR_PIPEA_SCAN_LINE_WINDOW	(1<<2)
+#define MI_WAIT_FOR_PIPEA_SCAN_LINE_WINDOW	(1<<1)
 
 /* Set the scan line for MI_WAIT_FOR_PIPE?_SCAN_LINE_WINDOW */
 #define MI_LOAD_SCAN_LINES_INCL			(0x12<<23)