diff --git a/mercurial/cext/revlog.c b/mercurial/cext/revlog.c
--- a/mercurial/cext/revlog.c
+++ b/mercurial/cext/revlog.c
@@ -208,7 +208,7 @@ static inline int index_get_parents(inde
  *
  * Returns 0 on success or -1 on failure.
  */
-int HgRevlogIndex_GetParents(PyObject *op, int rev, int *ps)
+static int HgRevlogIndex_GetParents(PyObject *op, int rev, int *ps)
 {
 	int tiprev;
 	if (!op || !HgRevlogIndex_Check(op) || !ps) {
diff --git a/mercurial/cext/revlog.h b/mercurial/cext/revlog.h
--- a/mercurial/cext/revlog.h
+++ b/mercurial/cext/revlog.h
@@ -14,6 +14,4 @@ extern PyTypeObject HgRevlogIndex_Type;
 
 #define HgRevlogIndex_Check(op) PyObject_TypeCheck(op, &HgRevlogIndex_Type)
 
-int HgRevlogIndex_GetParents(PyObject *op, int rev, int *ps);
-
 #endif /* _HG_REVLOG_H_ */