diff --git a/crates/nu-protocol/src/engine/pwd_per_drive.rs b/crates/nu-protocol/src/engine/pwd_per_drive.rs
index 9bcef36910..5be71041a3 100644
--- a/crates/nu-protocol/src/engine/pwd_per_drive.rs
+++ b/crates/nu-protocol/src/engine/pwd_per_drive.rs
@@ -81,14 +81,18 @@ pub mod windows {
             Ok(path_string) => {
                 if let Some(drive) = extract_drive_letter(&path_string) {
                     maintainer.maintain(env_var_for_drive(drive), value.clone());
+                    Ok(())
+                } else if path_string.is_empty() {
+                    Ok(())
+                } else {
+                    // Other path format, like UNC Network share path, or bash format
+                    // /c/Users/nushell will be supported later.
+                    Err(ShellError::InvalidValue {
+                        valid: format!("Can't detect drive letter from {}.", path_string),
+                        actual: path_string,
+                        span: Span::unknown(),
+                    })
                 }
-                // Other path format, like UNC Network share path, or bash format
-                // /c/Users/nushell will be supported later.
-                Err(ShellError::InvalidValue {
-                    valid: format!("Can't detect drive letter from {}.", path_string),
-                    actual: path_string,
-                    span: Span::unknown(),
-                })
             }
             Err(e) => Err(ShellError::InvalidValue {
                 valid: "$env.PWD should have String type and String::from_value() should be OK()."