diff --git a/TinySTL/Alloc.h b/TinySTL/Alloc.h
index b474787..d188df6 100644
--- a/TinySTL/Alloc.h
+++ b/TinySTL/Alloc.h
@@ -44,6 +44,12 @@ namespace TinySTL{
 		static void *reallocate(void *ptr, size_t old_sz, size_t new_sz);
 	};
 
+	char *alloc::start_free = 0;
+	char *alloc::end_free = 0;
+	size_t alloc::heap_size = 0;
+	alloc::obj *alloc::free_list[alloc::ENFreeLists::NFREELISTS] = {
+		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+	};
 }
 
 #endif
\ No newline at end of file
diff --git a/TinySTL/TinySTL.vcxproj b/TinySTL/TinySTL.vcxproj
index 1ef643d..6dab845 100644
--- a/TinySTL/TinySTL.vcxproj
+++ b/TinySTL/TinySTL.vcxproj
@@ -79,6 +79,7 @@
     <ClCompile Include="main.cpp" />
   </ItemGroup>
   <ItemGroup>
+    <ClInclude Include="Alloc.h" />
     <ClInclude Include="Construct.h" />
     <ClInclude Include="TypeTraits.h" />
   </ItemGroup>
diff --git a/TinySTL/TinySTL.vcxproj.filters b/TinySTL/TinySTL.vcxproj.filters
index f82fd29..1e1ae10 100644
--- a/TinySTL/TinySTL.vcxproj.filters
+++ b/TinySTL/TinySTL.vcxproj.filters
@@ -26,5 +26,8 @@
     <ClInclude Include="Construct.h">
       <Filter>头文件</Filter>
     </ClInclude>
+    <ClInclude Include="Alloc.h">
+      <Filter>头文件</Filter>
+    </ClInclude>
   </ItemGroup>
 </Project>
\ No newline at end of file