diff --git a/doc/ikarus-users-guide.tex b/doc/ikarus-users-guide.tex
index aa2914b..8574358 100644
--- a/doc/ikarus-users-guide.tex
+++ b/doc/ikarus-users-guide.tex
@@ -1876,10 +1876,8 @@ port-has-set-port-position!?    set-port-position!
 call-with-port        close-port
 get-bytevector-all    get-bytevector-some
 get-bytevector-n      get-bytevector-n!
-lookahead-char
-lookahead-u8
+lookahead-char         lookahead-u8
 get-string-all        get-string-n  get-string-n!  put-string
-get-datum             put-datum
 make-custom-binary-input-port         make-custom-binary-input/output-port    
 make-custom-binary-output-port        make-custom-textual-input-port    
 make-custom-textual-input/output-port make-custom-textual-output-port
diff --git a/scheme/ikarus.writer.ss b/scheme/ikarus.writer.ss
index df823e8..aae39f0 100644
--- a/scheme/ikarus.writer.ss
+++ b/scheme/ikarus.writer.ss
@@ -15,7 +15,8 @@
 
 
 (library (ikarus writer)
-  (export write display format printf fprintf print-error print-unicode print-graph)
+  (export write display format printf fprintf print-error print-unicode print-graph
+          put-datum)
   (import 
     (rnrs hashtables)
     (ikarus system $chars)
@@ -28,7 +29,8 @@
     (ikarus system $transcoders)
     (only (ikarus unicode-data) unicode-printable-char?) 
     (except (ikarus) 
-      write display format printf fprintf print-error print-unicode print-graph))
+      write display format printf fprintf print-error print-unicode print-graph
+      put-datum))
 
   (define print-unicode
     (make-parameter #t))
@@ -756,6 +758,11 @@
          (error 'write "not an output port" p))
        (write-to-port x p)]))
 
+  (define (put-datum p x)
+    (unless (output-port? p) 
+      (error 'put-datum "not an output port" p))
+    (write-to-port x p))
+
   (define display 
     (case-lambda
       [(x) (display-to-port x (current-output-port))]
diff --git a/scheme/last-revision b/scheme/last-revision
index 967ba32..9707e87 100644
--- a/scheme/last-revision
+++ b/scheme/last-revision
@@ -1 +1 @@
-1107
+1108
diff --git a/scheme/makefile.ss b/scheme/makefile.ss
index ed3dd14..4f58d8b 100755
--- a/scheme/makefile.ss
+++ b/scheme/makefile.ss
@@ -1137,7 +1137,7 @@
     [port?                                       i r ip]
     [put-bytevector                              r ip]
     [put-char                                    i r ip]
-    [put-datum                                   r ip]
+    [put-datum                                   i r ip]
     [put-string                                  r ip]
     [put-u8                                      i r ip]
     [set-port-position!                          r ip]
diff --git a/scheme/todo-r6rs.ss b/scheme/todo-r6rs.ss
index 3a149bf..03406fe 100755
--- a/scheme/todo-r6rs.ss
+++ b/scheme/todo-r6rs.ss
@@ -642,7 +642,7 @@
     [port?                                      C ip]
     [put-bytevector                             S ip]
     [put-char                                   C ip]
-    [put-datum                                  S ip]
+    [put-datum                                  C ip]
     [put-string                                 S ip]
     [put-u8                                     C ip]
     [set-port-position!                         S ip]