diff --git a/reactos/cmake/gcc.cmake b/reactos/cmake/gcc.cmake
index 6d6232427fd..7e8264467b4 100644
--- a/reactos/cmake/gcc.cmake
+++ b/reactos/cmake/gcc.cmake
@@ -92,7 +92,7 @@ endif()
 
 # Link-time code generation
 if(LTCG)
-    add_compile_flags("-flto -Wno-error=clobbered")
+    add_compile_flags("-flto -ffat-lto-objects")
 endif()
 
 if(ARCH STREQUAL "i386")
diff --git a/reactos/lib/drivers/lwip/CMakeLists.txt b/reactos/lib/drivers/lwip/CMakeLists.txt
index 26c4594bfce..907fd9ab4b0 100644
--- a/reactos/lib/drivers/lwip/CMakeLists.txt
+++ b/reactos/lib/drivers/lwip/CMakeLists.txt
@@ -60,4 +60,7 @@ add_library(lwip ${SOURCE})
 add_dependencies(lwip bugcodes)
 if(NOT MSVC)
     allow_warnings(lwip)
+    if(LTCG)
+        add_compile_flags("-fno-builtin-malloc -fno-builtin-free")
+    endif()
 endif()