diff --git a/dll/apisets/CMakeLists.txt b/dll/apisets/CMakeLists.txt
index 8e3518ebbfc..b667a3b0cd7 100644
--- a/dll/apisets/CMakeLists.txt
+++ b/dll/apisets/CMakeLists.txt
@@ -27,7 +27,7 @@ function (add_apiset apiset_name baseaddress)
     if(NOT MSVC)
         add_target_compile_flags(${apiset_name} "-fno-builtin")
     else()
-        add_target_compile_flags(${apiset_name} "/wd4026 /wd4273")
+        add_target_compile_flags(${apiset_name} "/wd4026 /wd4273 /Oi-")
     endif()
 
     add_importlibs(${apiset_name} ${ARGN} kernel32 ntdll)
diff --git a/dll/apisets/CMakeLists.txt.in b/dll/apisets/CMakeLists.txt.in
index cbe9003f467..770d4e06d91 100644
--- a/dll/apisets/CMakeLists.txt.in
+++ b/dll/apisets/CMakeLists.txt.in
@@ -27,7 +27,7 @@ function (add_apiset apiset_name baseaddress)
     if(NOT MSVC)
         add_target_compile_flags(${apiset_name} "-fno-builtin")
     else()
-        add_target_compile_flags(${apiset_name} "/wd4026 /wd4273")
+        add_target_compile_flags(${apiset_name} "/wd4026 /wd4273 /Oi-")
     endif()
 
     add_importlibs(${apiset_name} ${ARGN} kernel32 ntdll)