diff --git a/piclib/CMakeLists.txt b/piclib/CMakeLists.txt
index 25e77b3a..008e5ad5 100644
--- a/piclib/CMakeLists.txt
+++ b/piclib/CMakeLists.txt
@@ -21,7 +21,7 @@ list(APPEND PICLIB_SCHEME_LIBS
   ${PROJECT_SOURCE_DIR}/piclib/scheme/load.scm
   ${PROJECT_SOURCE_DIR}/piclib/scheme/process-context.scm
   ${PROJECT_SOURCE_DIR}/piclib/scheme/time.scm
-  # ${PROJECT_SOURCE_DIR}/piclib/scheme/r5rs.scm
+  ${PROJECT_SOURCE_DIR}/piclib/scheme/r5rs.scm
   ${PROJECT_SOURCE_DIR}/piclib/scheme/null.scm
 
   ${PROJECT_SOURCE_DIR}/piclib/srfi/1.scm
diff --git a/t/r7rs-tests.scm b/t/r7rs-tests.scm
index b96b14eb..6143a555 100644
--- a/t/r7rs-tests.scm
+++ b/t/r7rs-tests.scm
@@ -37,6 +37,7 @@
         (scheme eval)
         (scheme process-context)
         (scheme case-lambda)
+        (scheme r5rs)
         (picrin test))
 
 ;; R7RS test suite.  Covers all procedures and syntax in the small