diff --git a/cpp/ql/lib/semmle/code/cpp/commons/Strcat.qll b/cpp/ql/lib/semmle/code/cpp/commons/Strcat.qll
index 233963014b1..c9cd0b2ebdd 100644
--- a/cpp/ql/lib/semmle/code/cpp/commons/Strcat.qll
+++ b/cpp/ql/lib/semmle/code/cpp/commons/Strcat.qll
@@ -6,7 +6,7 @@ import cpp
  * A function that concatenates the string from its second argument
  * to the string from its first argument, for example `strcat`.
  */
-class StrcatFunction extends Function {
+deprecated class StrcatFunction extends Function {
   StrcatFunction() {
     getName() =
       [