diff --git a/CMakeLists.txt b/CMakeLists.txt
index 65d9c62b..35caa594 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -613,6 +613,6 @@ add_custom_target(sta_tags
 add_custom_command(
   TARGET OpenSTA
   POST_BUILD
-  COMMAND ${CMAKE_SOURCE_DIR}/etc/FindMessages.tcl > ${CMAKE_SOURCE_DIR}/doc/messages.txt || true
-  WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+  COMMAND ${STA_HOME}/etc/FindMessages.tcl > ${STA_HOME}/doc/messages.txt || true
+  WORKING_DIRECTORY ${STA_HOME}
 )