diff --git a/rcrypto-sys/build.rs b/rcrypto-sys/build.rs
index e9e83cf..ca5b047 100644
--- a/rcrypto-sys/build.rs
+++ b/rcrypto-sys/build.rs
@@ -37,14 +37,19 @@ fn update_tests() {
         }
 
         let test_name = fname.strip_suffix(".c").unwrap().replace('-', "_");
-        let exe_path = format!(
-            "{out_dir}/c-out/test_{test_name}.{EXE_EXTENSION}",
-            out_dir = out_dir.to_string_lossy()
-        );
+        let mut exe_path = out_dir.clone();
+        exe_path.extend(["c-out", &format!("test_{test_name}.{EXE_EXTENSION}")]);
+        let exe_path_str = exe_path.to_string_lossy();
+        let exe_path_str = exe_path_str.replace(r"\", r"\\");
+        // escape backslashes
+        // let exe_path = format!(
+        //     "{out_dir}/c-out/test_{test_name}.{EXE_EXTENSION}",
+        //     out_dir = out_dir.to_string_lossy()
+        // );
 
-        write!(
+        indoc::writedoc!(
             to_write,
-            indoc! {"
+            "
 
                 #[test]
                 fn test_{test_name}() {{
@@ -52,9 +57,9 @@ fn update_tests() {
                     let mut cmd = Command::new(\"{exe_path}\");
                     run_cmd_else_quit(&mut cmd, \"{fname}\");
                 }}
-            "},
+            ",
             test_name = test_name,
-            exe_path = exe_path,
+            exe_path = exe_path_str,
             fname = fname,
         )
         .unwrap();