diff --git a/my-listings.sty b/my-listings.sty
index de029c26c7e493657eb44742614cf1d690c5920d..cb5dc30ab866c30e4163e229b4b15d1feaf79a4a 100644
--- a/my-listings.sty
+++ b/my-listings.sty
@@ -80,7 +80,8 @@
 }
 
 \lstdefinelanguage{ADT}{
-  morekeywords={sorts, operations, equations, preconditions},
+  morekeywords={sorts, operations, equations, preconditions},,
+  identifierstyle=\color{black},
   mathescape=true
 }