diff --git a/CHANGES b/CHANGES
index 68620d659..fd1167588 100644
--- a/CHANGES
+++ b/CHANGES
@@ -46,6 +46,7 @@ Other fixes:
  - Shaders: Fix gba-color shader resolution (fixes mgba.io/i/1435)
  - Qt: Fix LibraryController initialization (fixes mgba.io/i/1324)
  - Switch: Fix audio when video rate desyncs (fixes mgba.io/i/1532)
+ - GB: Fix reading ROM immediately after unmapping BIOS
 Misc:
  - GBA Savedata: EEPROM performance fixes
  - GBA Savedata: Automatically map 1Mbit Flash files as 1Mbit Flash
diff --git a/src/gb/gb.c b/src/gb/gb.c
index 0e065a0a2..d030545f5 100644
--- a/src/gb/gb.c
+++ b/src/gb/gb.c
@@ -573,6 +573,7 @@ void GBUnmapBIOS(struct GB* gb) {
 	if (gb->memory.romBase < gb->memory.rom || gb->memory.romBase > &gb->memory.rom[gb->memory.romSize - 1]) {
 		free(gb->memory.romBase);
 		gb->memory.romBase = gb->memory.rom;
+		gb->cpu->memory.setActiveRegion(gb->cpu, gb->cpu->pc);
 	}
 	// XXX: Force AGB registers for AGB-mode
 	if (gb->model == GB_MODEL_AGB && gb->cpu->pc == 0x100) {