diff --git a/bochs/iodev/display/voodoo.cc b/bochs/iodev/display/voodoo.cc
index 858a0a02f..adbff25fd 100644
--- a/bochs/iodev/display/voodoo.cc
+++ b/bochs/iodev/display/voodoo.cc
@@ -468,7 +468,8 @@ bx_bool bx_voodoo_c::update_timing(void)
   }
   double vfreq = hfreq / (double)vtotal;
   BX_VOODOO_THIS s.vdraw.vtotal_usec = (unsigned)(1000000.0 / vfreq);
-  BX_VOODOO_THIS s.vdraw.vsync_usec = vsync * (unsigned)(1000000.0 / hfreq);
+  BX_VOODOO_THIS s.vdraw.htotal_usec = (unsigned)(1000000.0 / hfreq);
+  BX_VOODOO_THIS s.vdraw.vsync_usec = vsync * BX_VOODOO_THIS s.vdraw.htotal_usec;
   if ((BX_VOODOO_THIS s.vdraw.width != v->fbi.width) ||
       (BX_VOODOO_THIS s.vdraw.height != v->fbi.height)) {
     BX_VOODOO_THIS s.vdraw.width = v->fbi.width;
@@ -581,11 +582,14 @@ void bx_voodoo_c::redraw_area(unsigned x0, unsigned y0, unsigned width,
   v->fbi.video_changed = 1;
 }
 
-bx_bool bx_voodoo_c::get_retrace(void)
+Bit16u bx_voodoo_c::get_retrace(void)
 {
   Bit64u time_in_frame = bx_pc_system.time_usec()  - BX_VOODOO_THIS s.vdraw.frame_start;
-  if (time_in_frame > BX_VOODOO_THIS s.vdraw.vsync_usec) return 1;
-  else return 0;
+  if (time_in_frame > BX_VOODOO_THIS s.vdraw.vsync_usec) {
+    return 0;
+  } else {
+    return (BX_VOODOO_THIS s.vdraw.vsync_usec - time_in_frame) / BX_VOODOO_THIS s.vdraw.htotal_usec;
+  }
 }
 
 void bx_voodoo_c::output_enable(bx_bool enabled)
diff --git a/bochs/iodev/display/voodoo.h b/bochs/iodev/display/voodoo.h
index fa89bab7d..375ad0085 100644
--- a/bochs/iodev/display/voodoo.h
+++ b/bochs/iodev/display/voodoo.h
@@ -28,6 +28,7 @@ typedef struct {
   struct {
     Bit32u width;
     Bit32u height;
+    Bit64u htotal_usec;
     Bit64u vtotal_usec;
     Bit64u vsync_usec;
     Bit64u frame_start;
@@ -58,7 +59,7 @@ public:
   virtual Bit32u pci_read_handler(Bit8u address, unsigned io_len);
   virtual void   pci_write_handler(Bit8u address, Bit32u value, unsigned io_len);
 
-  static bx_bool get_retrace(void);
+  static Bit16u get_retrace(void);
   static void output_enable(bx_bool enabled);
   static void update_screen_start(void);
   static bx_bool update_timing(void);
diff --git a/bochs/iodev/display/voodoo_func.h b/bochs/iodev/display/voodoo_func.h
index 9736663b0..00d436fa9 100644
--- a/bochs/iodev/display/voodoo_func.h
+++ b/bochs/iodev/display/voodoo_func.h
@@ -2601,8 +2601,7 @@ Bit32u register_r(Bit32u offset)
       }
 
       /* bit 6 is the vertical retrace */
-      //result |= v->fbi.vblank << 6;
-      result |= Voodoo_get_retrace() << 6;
+      result |= (Voodoo_get_retrace() > 0) << 6;
 
       /* bit 7 is FBI graphics engine busy */
       if (v->pci.op_pending)
@@ -2664,6 +2663,10 @@ Bit32u register_r(Bit32u offset)
         result = v->dac.read_result;
       break;
 
+    case vRetrace:
+    case hvRetrace:
+      result = Voodoo_get_retrace() & 0x1fff;
+      break;
   }
 
   return result;