diff --git a/core/mem/virtual/virtual.odin b/core/mem/virtual/virtual.odin
index ae6206de7..73dabb20d 100644
--- a/core/mem/virtual/virtual.odin
+++ b/core/mem/virtual/virtual.odin
@@ -82,7 +82,7 @@ memory_block_alloc :: proc(committed, reserved: uint, alignment: uint = 0, flags
 	reserved  = align_formula(reserved, page_size)
 	committed = clamp(committed, 0, reserved)
 	
-	total_size     := reserved + alignment + size_of(Platform_Memory_Block)
+	total_size     := reserved + 2*alignment + size_of(Platform_Memory_Block)
 	base_offset    := mem.align_forward_uintptr(size_of(Platform_Memory_Block), max(uintptr(alignment), align_of(Platform_Memory_Block)))
 	protect_offset := uintptr(0)