diff --git a/src/apple2.c b/src/apple2.c
index 43164c3..21ec1b5 100644
--- a/src/apple2.c
+++ b/src/apple2.c
@@ -58,7 +58,7 @@ apple2_create(int width, int height)
     mach->memory = mach->cpu->memory;
 
     // Set the read/write mappers for everything
-    apple2_mem_map(mach->memory);
+    apple2_mem_map(mach);
 
     // Initliaze our system ROM and separate bank-switched block of RAM
     mach->rom = vm_segment_create(APPLE2_ROM_SIZE);