diff --git a/CMakeLists.txt b/CMakeLists.txt
index 94a4634f53c..0d23e48adb4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -452,7 +452,6 @@ else()
 endif()
 
 add_subdirectory(boards)
-add_subdirectory(ext)
 add_subdirectory(subsys)
 add_subdirectory(drivers)
 
diff --git a/ext/CMakeLists.txt b/ext/CMakeLists.txt
deleted file mode 100644
index 71bebdf6f8c..00000000000
--- a/ext/CMakeLists.txt
+++ /dev/null
@@ -1 +0,0 @@
-add_subdirectory(debug)
diff --git a/ext/debug/CMakeLists.txt b/ext/debug/CMakeLists.txt
deleted file mode 100644
index 7da89c8f5ce..00000000000
--- a/ext/debug/CMakeLists.txt
+++ /dev/null
@@ -1 +0,0 @@
-zephyr_include_directories_ifdef(CONFIG_TRACING_CTF ctf)
diff --git a/ext/debug/ctf/ctf_map.h b/subsys/tracing/ctf/ctf_map.h
similarity index 100%
rename from ext/debug/ctf/ctf_map.h
rename to subsys/tracing/ctf/ctf_map.h