diff --git a/.gitmodules b/.gitmodules
index a3a6c36b..b8f0b0ef 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,3 @@
 [submodule "extern/c4core"]
-	path = extern/c4core
+	path = ext/c4core
 	url = https://github.com/biojppm/c4core
diff --git a/CMakeLists.txt b/CMakeLists.txt
index ce5a722d..658163c3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,7 +1,7 @@
 cmake_minimum_required(VERSION 3.9)
 project(ryml)
 
-include(./extern/c4core/cmake/c4Project.cmake)
+include(./ext/c4core/cmake/c4Project.cmake)
 
 c4_declare_project(ryml
     STANDALONE
@@ -17,7 +17,7 @@ option(RYML_BUILD_API "Enable API generation (python, etc)" OFF)
 
 #-------------------------------------------------------
 set(RYML_SRC_DIR ${CMAKE_CURRENT_LIST_DIR}/src)
-set(RYML_EXT_DIR ${CMAKE_CURRENT_LIST_DIR}/extern)
+set(RYML_EXT_DIR ${CMAKE_CURRENT_LIST_DIR}/ext)
 set(RYML_API_DIR ${CMAKE_CURRENT_LIST_DIR}/api)
 
 
diff --git a/ext/c4core b/ext/c4core
new file mode 160000
index 00000000..61590b51
--- /dev/null
+++ b/ext/c4core
@@ -0,0 +1 @@
+Subproject commit 61590b510fbd4ec4cba217a545bcdc8ec3b53195
diff --git a/extern/c4core b/extern/c4core
deleted file mode 160000
index 9fdd3f1f..00000000
--- a/extern/c4core
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 9fdd3f1f90312e4fd411310499977dde14372e58