diff --git a/build.rs b/build.rs
index b2050f2..97965cc 100644
--- a/build.rs
+++ b/build.rs
@@ -6,8 +6,8 @@ fn main() {
 	if std::env::var("TARGET").is_ok_and(|s| s.contains("windows-msvc"))
 		&& std::env::var("PROFILE").is_ok_and(|p| p == "debug")
 	{
-		println!("cargo::rustc-env=CFLAGS=-MDd");
-		println!("cargo::rustc-env=CXXFLAGS=-MDd");
+		println!("cargo::rustc-env=CFLAGS=/MDd");
+		println!("cargo::rustc-env=CXXFLAGS=/MDd");
 
 		// Don't link the default CRT
 		// println!("cargo::rustc-link-arg=/nodefaultlib:msvcrt");