diff --git a/src/backend/utils/adt/selfuncs.c b/src/backend/utils/adt/selfuncs.c
index c746759eef4..1808388397a 100644
--- a/src/backend/utils/adt/selfuncs.c
+++ b/src/backend/utils/adt/selfuncs.c
@@ -290,7 +290,7 @@ eqsel_internal(PG_FUNCTION_ARGS, bool negate)
  * This is exported so that some other estimation functions can use it.
  */
 double
-var_eq_const(VariableStatData *vardata, Oid operator, Oid collation,
+var_eq_const(VariableStatData *vardata, Oid oproid, Oid collation,
 			 Datum constval, bool constisnull,
 			 bool varonleft, bool negate)
 {
@@ -331,7 +331,7 @@ var_eq_const(VariableStatData *vardata, Oid operator, Oid collation,
 	}
 	else if (HeapTupleIsValid(vardata->statsTuple) &&
 			 statistic_proc_security_check(vardata,
-										   (opfuncoid = get_opcode(operator))))
+										   (opfuncoid = get_opcode(oproid))))
 	{
 		AttStatsSlot sslot;
 		bool		match = false;
@@ -461,7 +461,7 @@ var_eq_const(VariableStatData *vardata, Oid operator, Oid collation,
  * This is exported so that some other estimation functions can use it.
  */
 double
-var_eq_non_const(VariableStatData *vardata, Oid operator, Oid collation,
+var_eq_non_const(VariableStatData *vardata, Oid oproid, Oid collation,
 				 Node *other,
 				 bool varonleft, bool negate)
 {
diff --git a/src/include/utils/selfuncs.h b/src/include/utils/selfuncs.h
index 49af4ed2ede..d485b9bfcd9 100644
--- a/src/include/utils/selfuncs.h
+++ b/src/include/utils/selfuncs.h
@@ -181,11 +181,11 @@ extern double ineq_histogram_selectivity(PlannerInfo *root,
 										 Oid collation,
 										 Datum constval, Oid consttype);
 extern double var_eq_const(VariableStatData *vardata,
-						   Oid operator, Oid collation,
+						   Oid oproid, Oid collation,
 						   Datum constval, bool constisnull,
 						   bool varonleft, bool negate);
 extern double var_eq_non_const(VariableStatData *vardata,
-							   Oid operator, Oid collation,
+							   Oid oproid, Oid collation,
 							   Node *other,
 							   bool varonleft, bool negate);