diff --git a/mesonbuild/cmake/toolchain.py b/mesonbuild/cmake/toolchain.py
index 7d73a7c..564e6de 100644
--- a/mesonbuild/cmake/toolchain.py
+++ b/mesonbuild/cmake/toolchain.py
@@ -196,7 +196,7 @@ class CMakeToolchain:
     @staticmethod
     def is_cmdline_option(compiler: 'Compiler', arg: str) -> bool:
         if compiler.get_argument_syntax() == 'msvc':
-            return arg.startswith('/')
+            return arg.startswith(('/','-'))
         else:
             if compiler.exelist[0] == 'zig' and arg in {'ar', 'cc', 'c++', 'dlltool', 'lib', 'ranlib', 'objcopy', 'rc'}:
                 return True