diff --git a/src/gb/gb.c b/src/gb/gb.c
index fa0d6482f..875cbf86e 100644
--- a/src/gb/gb.c
+++ b/src/gb/gb.c
@@ -483,12 +483,10 @@ void GBApplyPatch(struct GB* gb, struct Patch* patch) {
 		mappedMemoryFree(newRom, GB_SIZE_CART_MAX);
 		return;
 	}
-	if (gb->romVf) {
+	if (gb->romVf && gb->isPristine) {
 #ifndef FIXED_ROM_BUFFER
 		gb->romVf->unmap(gb->romVf, gb->memory.rom, gb->pristineRomSize);
 #endif
-		gb->romVf->close(gb->romVf);
-		gb->romVf = NULL;
 	}
 	gb->isPristine = false;
 	if (gb->memory.romBase == gb->memory.rom) {
diff --git a/src/gb/memory.c b/src/gb/memory.c
index e41050784..dccd91e08 100644
--- a/src/gb/memory.c
+++ b/src/gb/memory.c
@@ -1017,8 +1017,6 @@ void _pristineCow(struct GB* gb) {
 	}
 	if (gb->romVf) {
 		gb->romVf->unmap(gb->romVf, gb->memory.rom, gb->memory.romSize);
-		gb->romVf->close(gb->romVf);
-		gb->romVf = NULL;
 	}
 	gb->memory.rom = newRom;
 	GBMBCSwitchBank(gb, gb->memory.currentBank);
diff --git a/src/gba/core.c b/src/gba/core.c
index e81e66dac..1d3fffb9e 100644
--- a/src/gba/core.c
+++ b/src/gba/core.c
@@ -668,6 +668,9 @@ static size_t _GBACoreROMSize(const struct mCore* core) {
 	if (gba->romVf) {
 		return gba->romVf->size(gba->romVf);
 	}
+	if (gba->mbVf) {
+		return gba->mbVf->size(gba->mbVf);
+	}
 	return gba->pristineRomSize;
 }
 
diff --git a/src/gba/gba.c b/src/gba/gba.c
index 187d83373..6b833838e 100644
--- a/src/gba/gba.c
+++ b/src/gba/gba.c
@@ -557,16 +557,14 @@ void GBAApplyPatch(struct GBA* gba, struct Patch* patch) {
 		mappedMemoryFree(newRom, GBA_SIZE_ROM0);
 		return;
 	}
-	if (gba->romVf) {
+	if (gba->memory.rom) {
 #ifndef FIXED_ROM_BUFFER
 		if (!gba->isPristine) {
-			mappedMemoryFree(gba->memory.rom, GBA_SIZE_ROM0);
+			mappedMemoryFree(gba->memory.rom, gba->memory.romSize);
 		} else {
 			gba->romVf->unmap(gba->romVf, gba->memory.rom, gba->pristineRomSize);
 		}
 #endif
-		gba->romVf->close(gba->romVf);
-		gba->romVf = NULL;
 	}
 	gba->isPristine = false;
 	gba->memory.rom = newRom;
diff --git a/src/gba/memory.c b/src/gba/memory.c
index 09d3e7a74..3243fc5a1 100644
--- a/src/gba/memory.c
+++ b/src/gba/memory.c
@@ -1894,8 +1894,6 @@ void _pristineCow(struct GBA* gba) {
 	}
 	if (gba->romVf) {
 		gba->romVf->unmap(gba->romVf, gba->memory.rom, gba->memory.romSize);
-		gba->romVf->close(gba->romVf);
-		gba->romVf = NULL;
 	}
 	gba->memory.rom = newRom;
 	gba->memory.hw.gpioBase = &((uint16_t*) gba->memory.rom)[GPIO_REG_DATA >> 1];