diff --git a/piclib/CMakeLists.txt b/piclib/CMakeLists.txt
index 9e87e251..9157fda4 100644
--- a/piclib/CMakeLists.txt
+++ b/piclib/CMakeLists.txt
@@ -17,4 +17,7 @@ list(APPEND PICLIB_SCHEME_LIBS
   ${PROJECT_SOURCE_DIR}/piclib/srfi/60.scm
   ${PROJECT_SOURCE_DIR}/piclib/srfi/95.scm
   ${PROJECT_SOURCE_DIR}/piclib/srfi/111.scm
+
+  ${PROJECT_SOURCE_DIR}/piclib/picrin/user.scm
+  ${PROJECT_SOURCE_DIR}/piclib/picrin/repl.scm
   )
diff --git a/tools/main.scm b/piclib/picrin/repl.scm
similarity index 83%
rename from tools/main.scm
rename to piclib/picrin/repl.scm
index 7d1637e0..32c6f20b 100644
--- a/tools/main.scm
+++ b/piclib/picrin/repl.scm
@@ -1,16 +1,3 @@
-(define-library (picrin user)
-  (import (scheme base)
-          (scheme load)
-          (scheme process-context)
-          (scheme read)
-          (scheme write)
-          (scheme file)
-          (scheme inexact)
-          (scheme cxr)
-          (scheme lazy)
-          (scheme time)
-          (picrin macro)))
-
 (define-library (picrin repl)
   (import (scheme base)
           (scheme read)
@@ -80,8 +67,3 @@
         (main-loop))))
 
   (export repl))
-
-(import (picrin repl))
-
-(repl)
-
diff --git a/piclib/picrin/user.scm b/piclib/picrin/user.scm
new file mode 100644
index 00000000..db615a43
--- /dev/null
+++ b/piclib/picrin/user.scm
@@ -0,0 +1,14 @@
+;  the default repl environment
+
+(define-library (picrin user)
+  (import (scheme base)
+          (scheme load)
+          (scheme process-context)
+          (scheme read)
+          (scheme write)
+          (scheme file)
+          (scheme inexact)
+          (scheme cxr)
+          (scheme lazy)
+          (scheme time)
+          (picrin macro)))
diff --git a/tools/main.c b/tools/main.c
index dc342d82..e241a277 100644
--- a/tools/main.c
+++ b/tools/main.c
@@ -13,7 +13,8 @@ main(int argc, char *argv[], char **envp)
   pic = pic_open(argc, argv, envp);
 
   pic_try {
-    pic_load(pic, "/Users/yuichi/workspace/picrin/tools/main.scm");
+    pic_import(pic, pic_read_cstr(pic, "(picrin repl)"));
+    pic_funcall(pic, "repl", pic_nil_value());
   }
   pic_catch {
     pic_print_backtrace(pic, pic->err);