diff --git a/lib/srfi/159.sld b/lib/srfi/159.sld
index 653c8cb0..84a5b7d7 100644
--- a/lib/srfi/159.sld
+++ b/lib/srfi/159.sld
@@ -12,7 +12,6 @@
    trimmed trimmed/right trimmed/both trimmed/lazy
    fitted fitted/right fitted/both
    joined joined/prefix joined/suffix joined/last joined/dot joined/range
-   upcased downcased
    ;; columnar
    call-with-output-generator call-with-output-generators
    string->line-generator
diff --git a/lib/srfi/159/base.sld b/lib/srfi/159/base.sld
index c72efa01..4aff5ed6 100644
--- a/lib/srfi/159/base.sld
+++ b/lib/srfi/159/base.sld
@@ -9,5 +9,4 @@
    padded padded/right padded/both
    trimmed trimmed/right trimmed/both trimmed/lazy
    fitted fitted/right fitted/both
-   joined joined/prefix joined/suffix joined/last joined/dot joined/range
-   upcased downcased))
+   joined joined/prefix joined/suffix joined/last joined/dot joined/range))