diff --git a/CHANGES b/CHANGES
index 5038990fa..47863f4fe 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,4 +1,6 @@
 0.5.1: (Future)
+Bugfixes:
+ - GB MBC: Fix MBC7 when size is incorrectly specified
 Misc:
  - All: Only update version info if needed
 
diff --git a/src/gb/mbc.c b/src/gb/mbc.c
index 695653eda..b4bb79a2a 100644
--- a/src/gb/mbc.c
+++ b/src/gb/mbc.c
@@ -139,6 +139,7 @@ void GBMBCInit(struct GB* gb) {
 		break;
 	case GB_MBC7:
 		gb->memory.mbc = _GBMBC7;
+		gb->sramSize = GB_SIZE_EXTERNAL_RAM;
 		break;
 	case GB_MMM01:
 		mLOG(GB_MBC, WARN, "unimplemented MBC: MMM01");