diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4c2dc9baa..61531c62d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -496,6 +496,7 @@ if(PYTHONINTERP_FOUND AND
     TARGET flatc
     POST_BUILD
     COMMAND ${GENERATION_SCRIPT} "${FLATBUFFERS_FLATC_EXECUTABLE}"
+    WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
     COMMENT "Generating code..."
     VERBATIM)
 endif()