diff --git a/reactos/ReactOS.rbuild b/reactos/ReactOS.rbuild
index 11961b2624e..4deb521f10b 100644
--- a/reactos/ReactOS.rbuild
+++ b/reactos/ReactOS.rbuild
@@ -29,33 +29,29 @@
   <if property="GDB" value="0">
     <if property="OPTIMIZE" value="1">
         <compilerflag>-Os</compilerflag>
-        <compilerflag>-Wno-strict-aliasing</compilerflag>
         <compilerflag>-ftracer</compilerflag>
         <compilerflag>-momit-leaf-frame-pointer</compilerflag>
         <compilerflag>-mpreferred-stack-boundary=2</compilerflag>
     </if>
     <if property="OPTIMIZE" value="2">
         <compilerflag>-Os</compilerflag>
-        <compilerflag>-Wno-strict-aliasing</compilerflag>
         <compilerflag>-mpreferred-stack-boundary=2</compilerflag>
     </if>
     <if property="OPTIMIZE" value="3">
         <compilerflag>-O1</compilerflag>
-        <compilerflag>-Wno-strict-aliasing</compilerflag>
         <compilerflag>-mpreferred-stack-boundary=2</compilerflag>
     </if>
     <if property="OPTIMIZE" value="4">
         <compilerflag>-O2</compilerflag>
-        <compilerflag>-Wno-strict-aliasing</compilerflag>
         <compilerflag>-mpreferred-stack-boundary=2</compilerflag>
     </if>
     <if property="OPTIMIZE" value="5">
         <compilerflag>-O3</compilerflag>
-        <compilerflag>-Wno-strict-aliasing</compilerflag>
         <compilerflag>-mpreferred-stack-boundary=2</compilerflag>
     </if>
   </if>
 
+  <compilerflag>-Wno-strict-aliasing</compilerflag>
   <compilerflag>-Wpointer-arith</compilerflag>
   <linkerflag>-enable-stdcall-fixup</linkerflag>
 
diff --git a/reactos/lib/3rdparty/mingw/moldname-msvcrt.def b/reactos/lib/3rdparty/mingw/moldname-msvcrt.def
index b4f06807000..81049492177 100644
--- a/reactos/lib/3rdparty/mingw/moldname-msvcrt.def
+++ b/reactos/lib/3rdparty/mingw/moldname-msvcrt.def
@@ -156,3 +156,4 @@ nextafter
 snwprintf
 snprintf
 strtoull=_strtoui64
+vsnprintf