diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index 958e3c8fb3b..a75ae662888 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -1049,7 +1049,7 @@ string(REPLACE "\)" "\\)" JSON_HELP_FILES "${JSON_HELP_FILES}")
 add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/qgsexpression_texts.cpp
   COMMAND ${Python_EXECUTABLE} ${CMAKE_SOURCE_DIR}/scripts/process_function_template.py ${CMAKE_CURRENT_BINARY_DIR}/qgsexpression_texts.cpp.temp
   COMMAND ${CMAKE_COMMAND} -DSRC=${CMAKE_CURRENT_BINARY_DIR}/qgsexpression_texts.cpp.temp -DDST=${CMAKE_CURRENT_BINARY_DIR}/qgsexpression_texts.cpp -P ${CMAKE_SOURCE_DIR}/cmake/CopyIfChanged.cmake
-  DEPENDS ${JSON_HELP_FILES}
+  DEPENDS ${JSON_HELP_FILES} ${CMAKE_SOURCE_DIR}/scripts/process_function_template.py
   WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
 )