diff --git a/CHANGES b/CHANGES
index 91cf44743..69d3f618f 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,6 +1,7 @@
 medusa alpha 2: (Future)
 Bugfixes:
  - DS Video: Fix VRAM mirroring in the renderer (fixes mgba.io/i/561)
+ - DS Video: Fix extended modes 1.x screen base range (fixes mgba.io/i/568)
 Misc:
  - DS: Set boot complete bit in RAM on boot (fixes mgba.io/i/576, mgba.io/i/580, mgba.io/i/586)
 
diff --git a/src/ds/renderers/software.c b/src/ds/renderers/software.c
index d1399ff75..5c7776a1f 100644
--- a/src/ds/renderers/software.c
+++ b/src/ds/renderers/software.c
@@ -746,7 +746,7 @@ void DSVideoSoftwareRendererDrawBackgroundExt0(struct GBAVideoSoftwareRenderer*
 void DSVideoSoftwareRendererDrawBackgroundExt1(struct GBAVideoSoftwareRenderer* renderer, struct GBAVideoSoftwareBackground* background, int inY) {
 	BACKGROUND_BITMAP_INIT;
 
-	uint32_t screenBase = (background->screenBase & 0x1F00) * 8;
+	uint32_t screenBase = (background->screenBase & 0xFF00) * 8;
 	uint8_t color;
 	int width, height;
 	switch (background->size) {
@@ -803,7 +803,7 @@ void DSVideoSoftwareRendererDrawBackgroundExt1(struct GBAVideoSoftwareRenderer*
 void DSVideoSoftwareRendererDrawBackgroundExt2(struct GBAVideoSoftwareRenderer* renderer, struct GBAVideoSoftwareBackground* background, int inY) {
 	BACKGROUND_BITMAP_INIT;
 
-	uint32_t screenBase = (background->screenBase & 0x1F00) * 4;
+	uint32_t screenBase = (background->screenBase & 0xFF00) * 4;
 	uint32_t color;
 	int width, height;
 	switch (background->size) {