diff --git a/lib/chibi/io.sld b/lib/chibi/io.sld
index feae0e1d..84184322 100644
--- a/lib/chibi/io.sld
+++ b/lib/chibi/io.sld
@@ -8,7 +8,7 @@
           make-null-output-port make-null-input-port
           make-broadcast-port make-concatenated-port
           make-generated-input-port make-filtered-output-port
-          make-filtered-input-port string-count
+          make-filtered-input-port string-count-chars
           open-input-bytevector open-output-bytevector get-output-bytevector
           string->utf8 utf8->string
           write-string write-u8 read-u8 peek-u8 send-file
diff --git a/lib/chibi/io/io.scm b/lib/chibi/io/io.scm
index a1bdfbd1..acb33a50 100644
--- a/lib/chibi/io/io.scm
+++ b/lib/chibi/io/io.scm
@@ -136,7 +136,7 @@
            ((if (pair? res) (= 0 (car res)) #t)
             eof)
            (else
-            (port-line-set! in (+ (string-count #\newline (cadr res) 0)
+            (port-line-set! in (+ (string-count-chars #\newline (cadr res) 0)
                                   (port-line in)))
             (cadr res)))))))
 
@@ -161,7 +161,7 @@
       (error "string to small to read chars" str n))
   (let* ((in (if (pair? o) (car o) (current-input-port)))
          (res (%read-string! str n in)))
-    (port-line-set! in (+ (string-count #\newline str 0 n) (port-line in)))
+    (port-line-set! in (+ (string-count-chars #\newline str 0 n) (port-line in)))
     res))
 
 ;;> Sends the entire contents of a file or input port to an output port.
diff --git a/lib/chibi/io/io.stub b/lib/chibi/io/io.stub
index 04b239a1..818a9ccc 100644
--- a/lib/chibi/io/io.stub
+++ b/lib/chibi/io/io.stub
@@ -38,7 +38,7 @@
 (define-c sexp (get-output-bytevector "sexp_get_output_bytevector")
   ((value ctx sexp) (value self sexp) sexp))
 
-(define-c sexp (string-count "sexp_string_count")
+(define-c sexp (string-count-chars "sexp_string_count")
   ((value ctx sexp) (value self sexp) sexp sexp sexp (default NULL sexp)))
 (define-c sexp (%string->utf8 "sexp_string_to_utf8")
   ((value ctx sexp) (value self sexp) sexp))