diff --git a/docs/CMakeLists.txt b/docs/CMakeLists.txt
index 79a56f063..9d617038d 100644
--- a/docs/CMakeLists.txt
+++ b/docs/CMakeLists.txt
@@ -8,7 +8,8 @@ endif()
 get_target_property(FASTGLTF_SOURCES fastgltf SOURCES)
 set(FASTGLTF_ABS_SOURCES "")
 foreach (SOURCE_FILE ${FASTGLTF_SOURCES})
-    list(APPEND FASTGLTF_ABS_SOURCES "${CMAKE_CURRENT_SOURCE_DIR}/../${SOURCE_FILE}")
+    cmake_path(ABSOLUTE_PATH SOURCE_FILE BASE_DIRECTORY "${CMAKE_CURRENT_LIST_DIR}/.." OUTPUT_VARIABLE ABSOLUTE_SOURCE_FILE)
+    list(APPEND FASTGLTF_ABS_SOURCES ${ABSOLUTE_SOURCE_FILE})
 endforeach()
 
 # For the Doxygen file we remove the semicolons for spaces