diff --git a/lib/std/core/allocators/temp_allocator.c3 b/lib/std/core/allocators/temp_allocator.c3
index 1349c4de8..698b4e991 100644
--- a/lib/std/core/allocators/temp_allocator.c3
+++ b/lib/std/core/allocators/temp_allocator.c3
@@ -101,7 +101,7 @@ private fn void! TempAllocator._free(TempAllocator* this, void* old_pointer)
 private fn void! TempAllocator._reset(TempAllocator* this, usize mark)
 {
 	TempAllocatorPage *last_page = this.last_page;
-	while (last_page && last_page.mark >= mark)
+	while (last_page && last_page.mark > mark)
 	{
 		TempAllocatorPage *to_free = last_page;
 		last_page = last_page.prev_page;
@@ -231,7 +231,7 @@ private fn void*! TempAllocator._alloc(TempAllocator* this, usize size, usize al
 	// Mark it as a page
 	page.ident = ~(usize)0;
 	// Store when it was created
-	page.mark = this.used;
+	page.mark = ++this.used;
 	// Hook up the page.
 	page.prev_page = this.last_page;
 	this.last_page = page;