Index: include/parrot/string_primitives.h
===================================================================
--- include/parrot/string_primitives.h	(revision 26507)
+++ include/parrot/string_primitives.h	(working copy)
@@ -19,7 +19,7 @@
 
 PARROT_API
 PARROT_CONST_FUNCTION
-UINTVAL Parrot_char_digit_value(SHIM_INTERP, UINTVAL character);
+INTVAL Parrot_char_digit_value(SHIM_INTERP, UINTVAL character);
 
 PARROT_API
 PARROT_MALLOC
Index: src/string_primitives.c
===================================================================
--- src/string_primitives.c	(revision 26507)
+++ src/string_primitives.c	(working copy)
@@ -291,7 +291,7 @@
 
 =over 4
 
-=item C<UINTVAL Parrot_char_digit_value>
+=item C<INTVAL Parrot_char_digit_value>
 
 Returns the decimal digit value of the specified character if it is a decimal
 digit character. If not, then -1 is returned.
@@ -306,7 +306,7 @@
 
 PARROT_API
 PARROT_CONST_FUNCTION
-UINTVAL
+INTVAL
 Parrot_char_digit_value(SHIM_INTERP, UINTVAL character)
 {
 #if PARROT_HAS_ICU