Index: include/parrot/datatypes.h
===================================================================
--- include/parrot/datatypes.h	(revision 18860)
+++ include/parrot/datatypes.h	(working copy)
@@ -129,7 +129,7 @@
 /* HEADERIZER BEGIN: src/datatypes.c */
 
 PARROT_API INTVAL Parrot_get_datatype_enum( Interp *interp,
-    const STRING *typename /*NN*/ )
+    const STRING *type_name /*NN*/ )
         __attribute__nonnull__(2);
 
 PARROT_API STRING * Parrot_get_datatype_name( Interp *interp, INTVAL type );
Index: src/datatypes.c
===================================================================
--- src/datatypes.c	(revision 18860)
+++ src/datatypes.c	(working copy)
@@ -24,15 +24,15 @@
 /*
 
 FUNCDOC: Parrot_get_datatype_enum
-Return datatype C<enum> for C<STRING*> typename.
+Return datatype C<enum> for C<STRING*> type_name.
 
 */
 
 PARROT_API
 INTVAL
-Parrot_get_datatype_enum(Interp *interp, const STRING * const typename /*NN*/)
+Parrot_get_datatype_enum(Interp *interp, const STRING * const type_name /*NN*/)
 {
-    char * const type = string_to_cstring(interp, typename);
+    char * const type = string_to_cstring(interp, type_name);
     int i;
 
     for (i = enum_first_type; i < enum_last_type; i++) {