diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index d1338ea..854ef19 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -64,6 +64,20 @@
             # change too often in ways that don't affect the result
             # ((un)commenting some options).
     )
+    add_custom_command(
+        OUTPUT
+            ${CMAKE_CURRENT_SOURCE_DIR}/opt-testcases/tls13-compat.sh
+        WORKING_DIRECTORY
+            ${CMAKE_CURRENT_SOURCE_DIR}/..
+        COMMAND
+            "${MBEDTLS_PYTHON_EXECUTABLE}"
+            "${CMAKE_CURRENT_SOURCE_DIR}/scripts/generate_tls13_compat_tests.py"
+        DEPENDS
+            ${CMAKE_CURRENT_SOURCE_DIR}/../framework/scripts/generate_test_keys.py
+    )
+    add_custom_target(tls13-compat.sh
+        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/opt-testcases/tls13-compat.sh)
+
 else()
     foreach(file ${all_generated_data_files})
         link_to_source(${file})