diff --git a/src/mnemonics/language_base.h b/src/mnemonics/language_base.h
index 74c495f5..0f1062b0 100644
--- a/src/mnemonics/language_base.h
+++ b/src/mnemonics/language_base.h
@@ -122,7 +122,7 @@ namespace Language
      * \brief Returns the number of unique starting characters to be used for matching.
      * \return Number of unique starting characters.
      */
-    std::string get_trim_length() const
+    int get_trim_length() const
     {
       return trim_length;
     }