diff --git a/src/hardware/vga_seq.cpp b/src/hardware/vga_seq.cpp
index ce5e0cfd..cbb85349 100644
--- a/src/hardware/vga_seq.cpp
+++ b/src/hardware/vga_seq.cpp
@@ -37,6 +37,8 @@ void write_p3c5(Bit32u port,Bit8u val) {
 		break;
 	case 1:		/* Clocking Mode */
 		seq(clocking_mode)=val;
+		vga.config.pixel_double=(val & 8)>0;
+		VGA_FindSettings();
 		/* TODO Figure this out :)
 			0	If set character clocks are 8 dots wide, else 9.
 			2	If set loads video serializers every other character