diff --git a/src/devices/video/pc_vga.cpp b/src/devices/video/pc_vga.cpp
index 81b095dce34..2bc5caa11b1 100644
--- a/src/devices/video/pc_vga.cpp
+++ b/src/devices/video/pc_vga.cpp
@@ -1489,7 +1489,7 @@ void vga_device::crtc_reg_write(uint8_t index, uint8_t data)
 			break;
 		case 0x0c:
 		case 0x0d:
-			//if(machine().first_screen()->vpos() < (vga.crtc.vert_retrace_start)) break;
+			if(machine().first_screen()->vpos() < (vga.crtc.vert_retrace_start)) break;
 			vga.crtc.start_addr_latch &= ~(0xff << (((index & 1)^1) * 8));
 			vga.crtc.start_addr_latch |= (data << (((index & 1)^1) * 8));
 			break;