diff --git a/ice-9/boot-9.scm b/ice-9/boot-9.scm
index defab8bfb..7756b4ccd 100644
--- a/ice-9/boot-9.scm
+++ b/ice-9/boot-9.scm
@@ -51,6 +51,34 @@
 
 (define format simple-format)
 
+;; this is scheme wrapping the C code so the final pred call is a tail call,
+;; per SRFI-13 spec
+(define (string-any char_pred s . rest)
+  (let ((start (if (null? rest)
+		   0 (car rest)))
+	(end   (if (or (null? rest) (null? (cdr rest)))
+		   (string-length s) (cadr rest))))
+    (if (and (procedure? char_pred)
+	     (> end start)
+	     (<= end (string-length s))) ;; let c-code handle range error
+	(or (string-any-c-code char_pred s start (1- end))
+	    (char_pred (string-ref s (1- end))))
+	(string-any-c-code char_pred s start end))))
+
+;; this is scheme wrapping the C code so the final pred call is a tail call,
+;; per SRFI-13 spec
+(define (string-every char_pred s . rest)
+  (let ((start (if (null? rest)
+		   0 (car rest)))
+	(end   (if (or (null? rest) (null? (cdr rest)))
+		   (string-length s) (cadr rest))))
+    (if (and (procedure? char_pred)
+	     (> end start)
+	     (<= end (string-length s))) ;; let c-code handle range error
+	(and (string-every-c-code char_pred s start (1- end))
+	     (char_pred (string-ref s (1- end))))
+	(string-every-c-code char_pred s start end))))
+
 
 
 ;;; {EVAL-CASE}
diff --git a/libguile/srfi-13.c b/libguile/srfi-13.c
index 169bbc94b..c00279092 100644
--- a/libguile/srfi-13.c
+++ b/libguile/srfi-13.c
@@ -75,7 +75,7 @@ race_error ()
 }
 #endif
 
-SCM_DEFINE (scm_string_any, "string-any", 2, 2, 0,
+SCM_DEFINE (scm_string_any, "string-any-c-code", 2, 2, 0,
             (SCM char_pred, SCM s, SCM start, SCM end),
 	    "Check if the predicate @var{pred} is true for any character in\n"
 	    "the string @var{s}.\n"
@@ -134,7 +134,7 @@ SCM_DEFINE (scm_string_any, "string-any", 2, 2, 0,
 #undef FUNC_NAME
 
 
-SCM_DEFINE (scm_string_every, "string-every", 2, 2, 0,
+SCM_DEFINE (scm_string_every, "string-every-c-code", 2, 2, 0,
             (SCM char_pred, SCM s, SCM start, SCM end),
 	    "Check if the predicate @var{pred} is true for every character\n"
 	    "in the string @var{s}.\n"