diff --git a/core/mem.c b/core/mem.c
index c33d552..37f068e 100644
--- a/core/mem.c
+++ b/core/mem.c
@@ -36,7 +36,7 @@ int memSetup(paddr_t upperMemKB, paddr_t *firstUsed, paddr_t *lastMemUsedOut)
     // Remove addr from 0 to PAGE_SIZE so we can return 0 for no page available
     memAddBank(0, PAGE_SIZE, 0);
 
-    memAddBank(*lastMemUsedOut, *lastMemUsedOut, 0);
+    memAddBank(*firstUsed, *lastMemUsedOut, 0);
 
     return 0;
 }