diff --git a/env-hooks/10.rttlua_completion.sh.develspace.in b/env-hooks/10.rttlua_completion.sh.develspace.in
index 0af8d5c..cf9433e 100644
--- a/env-hooks/10.rttlua_completion.sh.develspace.in
+++ b/env-hooks/10.rttlua_completion.sh.develspace.in
@@ -7,4 +7,4 @@ export LUA_PATH="$LUA_PATH;@CMAKE_CURRENT_SOURCE_DIR@/?.lua"
 if [ "x$LUA_CPATH" = "x" ]; then
    LUA_CPATH=";"
 fi
-export LUA_CPATH="$LUA_CPATH;@CMAKE_CURRENT_SOURCE_DIR@/?.so"
+export LUA_CPATH="$LUA_CPATH;@CMAKE_LIBRARY_OUTPUT_DIRECTORY@/?.so"