diff --git a/src/exec/input.rs b/src/exec/input.rs
index 27affb6..1026c17 100644
--- a/src/exec/input.rs
+++ b/src/exec/input.rs
@@ -75,7 +75,7 @@ mod path_tests {
     #[test]
     #[cfg(windows)]
     fn dirname_root() {
-        assert_eq!(dirname(&PathBuf::from("C:\\")), OsString::from("C:"));
+        assert_eq!(dirname(&PathBuf::from("C:")), OsString::from("C:"));
         assert_eq!(dirname(&PathBuf::from("\\")), OsString::from("\\"));
     }