diff --git a/src/vid_stg_ramdac.c b/src/vid_stg_ramdac.c
index 2afcee8..06f4f03 100644
--- a/src/vid_stg_ramdac.c
+++ b/src/vid_stg_ramdac.c
@@ -60,6 +60,7 @@ void stg_ramdac_out(uint16_t addr, uint8_t val, stg_ramdac_t *ramdac, svga_t *sv
                                 default: svga->bpp =  8; break;
                         }
                 }
+                svga_recalctimings(svga);
                 if (didwrite) return;
                 break;
                 case 0x3c7: case 0x3c8: case 0x3c9:
diff --git a/src/vid_unk_ramdac.c b/src/vid_unk_ramdac.c
index d21038e..ccc83f8 100644
--- a/src/vid_unk_ramdac.c
+++ b/src/vid_unk_ramdac.c
@@ -32,6 +32,7 @@ void unk_ramdac_out(uint16_t addr, uint8_t val, unk_ramdac_t *ramdac, svga_t *sv
                                 svga->bpp = 16;
                                 break;
                         }
+                        svga_recalctimings(svga);
                         return;
                 }
                 ramdac->state = 0;