diff --git a/pylib/gyp/generator/msvs.py b/pylib/gyp/generator/msvs.py
index 8308fa84..3f227f88 100644
--- a/pylib/gyp/generator/msvs.py
+++ b/pylib/gyp/generator/msvs.py
@@ -3466,6 +3466,8 @@ def _GetValueFormattedForMSBuild(tool_name, name, value):
         formatted_value = char.join(
             [MSVSSettings.ConvertVCMacrosToMSBuild(i) for i in value]
         )
+        if tool_name == "ClCompile" and name == "AdditionalOptions":
+            formatted_value += os.environ.get("CL", "").replace("#", "=")
     else:
         formatted_value = MSVSSettings.ConvertVCMacrosToMSBuild(value)
     return formatted_value