diff --git a/piclib/CMakeLists.txt b/piclib/CMakeLists.txt
index aaf66fdd..b32b3690 100644
--- a/piclib/CMakeLists.txt
+++ b/piclib/CMakeLists.txt
@@ -1,5 +1,5 @@
 list(APPEND PICLIB_SCHEME_LIBS
-  ${PROJECT_SOURCE_DIR}/piclib/built-in.scm
+  ${PROJECT_SOURCE_DIR}/piclib/prelude.scm
   ${PROJECT_SOURCE_DIR}/piclib/picrin/array.scm
   ${PROJECT_SOURCE_DIR}/piclib/picrin/dictionary.scm
   ${PROJECT_SOURCE_DIR}/piclib/srfi/1.scm
diff --git a/piclib/built-in.scm b/piclib/prelude.scm
similarity index 100%
rename from piclib/built-in.scm
rename to piclib/prelude.scm