diff --git a/BasiliskII/src/Unix/main_unix.cpp b/BasiliskII/src/Unix/main_unix.cpp
index 4de39700..9e5619d3 100644
--- a/BasiliskII/src/Unix/main_unix.cpp
+++ b/BasiliskII/src/Unix/main_unix.cpp
@@ -567,12 +567,13 @@ int main(int argc, char **argv)
 		// Speculatively enables 33-bit addressing
 		ThirtyThreeBitAddressing = true;
 #endif
-		RAMBaseHost = (uint8 *)vm_acquire_mac(RAMSize);
-		ROMBaseHost = (uint8 *)vm_acquire_mac(0x100000);
-		if (RAMBaseHost == VM_MAP_FAILED || ROMBaseHost == VM_MAP_FAILED) {
+		uint8 *ram_rom_area = (uint8 *)vm_acquire_mac(RAMSize + 0x100000);
+		if (ram_rom_area == VM_MAP_FAILED) {	
 			ErrorAlert(STR_NO_MEM_ERR);
 			QuitEmulator();
 		}
+		RAMBaseHost = ram_rom_area;
+		ROMBaseHost = RAMBaseHost + RAMSize;
 	}
 
 #if USE_SCRATCHMEM_SUBTERFUGE
@@ -850,11 +851,8 @@ void QuitEmulator(void)
 
 	// Free ROM/RAM areas
 	if (RAMBaseHost != VM_MAP_FAILED) {
-		vm_release(RAMBaseHost, RAMSize);
+		vm_release(RAMBaseHost, RAMSize + 0x100000);
 		RAMBaseHost = NULL;
-	}
-	if (ROMBaseHost != VM_MAP_FAILED) {
-		vm_release(ROMBaseHost, 0x100000);
 		ROMBaseHost = NULL;
 	}