diff --git a/gnat/tools/json_schema.gpr b/gnat/tools/json_schema.gpr
index 22ff424d..e600cf44 100644
--- a/gnat/tools/json_schema.gpr
+++ b/gnat/tools/json_schema.gpr
@@ -16,7 +16,10 @@ project JSON_Schema is
      ("../../tools/json_schema");
    for Main use ("json_schema-driver.adb");
 
-   package Compiler renames VSS_Common.Compiler;
+   package Compiler is
+      for Switches ("Ada") use
+        VSS_Common.Ada_Compiler_Switches & "-gnat2022";
+   end Compiler;
 
    package Linker renames VSS_Common.Linker;