diff --git a/CHANGES b/CHANGES
index 641bd96a7..154475c82 100644
--- a/CHANGES
+++ b/CHANGES
@@ -21,6 +21,7 @@ Bugfixes:
  - Qt: Fix crash when changing audio settings after a game is closed
  - GBA BIOS: Fix ArcTan sign in HLE BIOS
  - GBA BIOS: Fix ArcTan2 sign in HLE BIOS (fixes mgba.io/i/689)
+ - GBA Video: Don't update background scanline params in mode 0 (fixes mgba.io/i/377)
 Misc:
  - Qt: Improved HiDPI support
  - Feature: Support ImageMagick 7
diff --git a/src/gba/renderers/video-software.c b/src/gba/renderers/video-software.c
index a4194152c..17fc467a9 100644
--- a/src/gba/renderers/video-software.c
+++ b/src/gba/renderers/video-software.c
@@ -820,10 +820,12 @@ static void _drawScanline(struct GBAVideoSoftwareRenderer* renderer, int y) {
 			}
 		}
 	}
-	renderer->bg[2].sx += renderer->bg[2].dmx;
-	renderer->bg[2].sy += renderer->bg[2].dmy;
-	renderer->bg[3].sx += renderer->bg[3].dmx;
-	renderer->bg[3].sy += renderer->bg[3].dmy;
+	if (GBARegisterDISPCNTGetMode(renderer->dispcnt) != 0) {
+		renderer->bg[2].sx += renderer->bg[2].dmx;
+		renderer->bg[2].sy += renderer->bg[2].dmy;
+		renderer->bg[3].sx += renderer->bg[3].dmx;
+		renderer->bg[3].sy += renderer->bg[3].dmy;
+	}
 }
 
 static void _updatePalettes(struct GBAVideoSoftwareRenderer* renderer) {