diff --git a/src/jrd/alt.cpp b/src/jrd/alt.cpp
index d9073ebcba..a501ae0da5 100644
--- a/src/jrd/alt.cpp
+++ b/src/jrd/alt.cpp
@@ -823,10 +823,6 @@ void API_ROUTINE CVT_move(const dsc*, dsc*, FPTR_ERROR err)
 // This function was exported earlier for reasons, not completely clear to me.
 // It MUST not be ever exported - looks like I've missed bad commit in CVS.
 // Keep it here to avoid senseless API change.
-enum ast_t
-{
-    AST_dummy
-};
 
 void API_ROUTINE SCH_ast(enum ast_t)
 {
diff --git a/src/jrd/alt_proto.h b/src/jrd/alt_proto.h
index 55179b7e8c..2639e13c8a 100644
--- a/src/jrd/alt_proto.h
+++ b/src/jrd/alt_proto.h
@@ -194,9 +194,14 @@ ISC_STATUS	API_ROUTINE isc_add_user(ISC_STATUS*, const USER_SEC_DATA*);
 ISC_STATUS	API_ROUTINE isc_delete_user(ISC_STATUS*, const USER_SEC_DATA*);
 ISC_STATUS	API_ROUTINE isc_modify_user(ISC_STATUS*, const USER_SEC_DATA*);
 
-// unsupported private API call - added to prevent application startup problems
+// unsupported private API call(s) - added to prevent application startup problems
 struct dsc;
 void		API_ROUTINE CVT_move(const dsc*, dsc*, FPTR_ERROR);
+enum ast_t
+{
+    AST_dummy
+};
+void 		API_ROUTINE SCH_ast(enum ast_t);
 
 } // extern "C"