diff --git a/core/os/os.odin b/core/os/os.odin
index 71a8a5c9f..d5ac23b62 100644
--- a/core/os/os.odin
+++ b/core/os/os.odin
@@ -200,7 +200,7 @@ heap_allocator_proc :: proc(allocator_data: rawptr, mode: mem.Allocator_Mode,
 		// NOTE(bill): Does nothing
 
 	case .Resize:
-		return heap_resize(ptr, size);
+		return heap_resize(old_memory, size);
 	}
 
 	return nil;