diff --git a/src/name_resolver.rs b/src/name_resolver.rs
index 05a36fb..9b5d528 100644
--- a/src/name_resolver.rs
+++ b/src/name_resolver.rs
@@ -34,7 +34,7 @@ impl<'a, T: AsRef<str>> NameResolver<'a, T> {
             .lookup_token(source_position.line, source_position.column)?;
 
         let is_exactish_match = token.get_dst_line() == source_position.line
-            && token.get_dst_col() >= source_position.column - 1;
+            && token.get_dst_col() >= source_position.column.saturating_sub(1);
 
         if is_exactish_match {
             token.get_name()