diff --git a/CHANGES b/CHANGES
index fc2436f71..f60f6b8e9 100644
--- a/CHANGES
+++ b/CHANGES
@@ -91,6 +91,7 @@ Emulation fixes:
  - ARM: Partially fix LDM/STM writeback with empty register list
  - GBA DMA: Fix case where DMAs could get misaligned (fixes mgba.io/i/1092)
  - GBA Video: Fix OpenGL renderer 512x512 backgrounds (fixes mgba.io/i/1572)
+ - GBA Memory: Fix open bus from IWRAM (fixes mgba.io/i/1575)
 Other fixes:
  - 3DS: Fix screen darkening (fixes mgba.io/i/1562)
  - Vita: Fix analog controls (fixes mgba.io/i/1554)
diff --git a/src/gba/memory.c b/src/gba/memory.c
index d70578830..091bfa1e1 100644
--- a/src/gba/memory.c
+++ b/src/gba/memory.c
@@ -353,10 +353,10 @@ static void GBASetActiveRegion(struct ARMCore* cpu, uint32_t address) {
 			case REGION_WORKING_IRAM: \
 				/* This doesn't handle prefetch clobbering */ \
 				if (cpu->gprs[ARM_PC] & 2) { \
-					value |= cpu->prefetch[0] << 16; \
-				} else { \
 					value <<= 16; \
 					value |= cpu->prefetch[0]; \
+				} else { \
+					value |= cpu->prefetch[0] << 16; \
 				} \
 				break; \
 			default: \