diff --git a/app/win/build b/app/win/build
index e678c254a8..009dd65e32 100644
--- a/app/win/build
+++ b/app/win/build
@@ -37,6 +37,7 @@ cp "$SCRIPT_DIR/mozconfig" "$gecko_path"
 
 if [[ $arch == "arm64" || $arch == "win32" ]]; then
 	export Z_ARCH=$arch
+	export RUST_TARGET=$rust_target-pc-windows-msvc
 fi
 
 cd "$gecko_path"