diff --git a/docs/CMakeLists.txt b/docs/CMakeLists.txt
index 0eb09b7..82a4ebb 100644
--- a/docs/CMakeLists.txt
+++ b/docs/CMakeLists.txt
@@ -11,12 +11,17 @@ if(NOT RES EQUAL 0 )
   message(FATAL_ERROR "Failed to install Python dependencies:\n${ERR}")
 endif()
 
+get_target_property(errors_docs_BINARY_DIR errors_docs BINARY_DIR)
+get_target_property(errors_format_docs_BINARY_DIR errors_format_docs BINARY_DIR)
+
 add_custom_command(
   OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/html/index.html
   COMMAND ${Python_EXECUTABLE} -m sphinx -b html ${CMAKE_CURRENT_SOURCE_DIR} ${CMAKE_CURRENT_BINARY_DIR}/html -W --keep-going
   DEPENDS
     ${CMAKE_CURRENT_SOURCE_DIR}/conf.py
     ${CMAKE_CURRENT_SOURCE_DIR}/index.rst
+    ${errors_docs_BINARY_DIR}/errors_docs.stamp
+    ${errors_format_docs_BINARY_DIR}/errors_format_docs.stamp
 )
 
 add_custom_target(docs ALL DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/html/index.html)