diff --git a/crates/texlab/src/util.rs b/crates/texlab/src/util.rs
index c40ba8b5..d9ec5a2f 100644
--- a/crates/texlab/src/util.rs
+++ b/crates/texlab/src/util.rs
@@ -22,7 +22,7 @@ pub fn normalize_uri(uri: &mut lsp_types::Url) {
 }
 
 fn fix_drive_letter(text: &str) -> Option<String> {
-    if !text.is_ascii() {
+    if !text.is_ascii() || text.len() == 0 {
         return None;
     }