diff --git a/piclib/CMakeLists.txt b/piclib/CMakeLists.txt
index b32b3690..6898de1b 100644
--- a/piclib/CMakeLists.txt
+++ b/piclib/CMakeLists.txt
@@ -8,4 +8,5 @@ list(APPEND PICLIB_SCHEME_LIBS
   ${PROJECT_SOURCE_DIR}/piclib/srfi/43.scm
   ${PROJECT_SOURCE_DIR}/piclib/srfi/60.scm
   ${PROJECT_SOURCE_DIR}/piclib/srfi/95.scm
+  ${PROJECT_SOURCE_DIR}/piclib/srfi/111.scm
   )
diff --git a/piclib/srfi/111.scm b/piclib/srfi/111.scm
new file mode 100644
index 00000000..aafb4c8b
--- /dev/null
+++ b/piclib/srfi/111.scm
@@ -0,0 +1,8 @@
+(define-library (srfi 111)
+  (import (scheme base))
+
+  (define-record-type box-type (box value) box?
+                      (value unbox set-box!))
+
+  (export box box?
+          unbox set-box!))