diff --git a/src/backend/utils/fmgr/funcapi.c b/src/backend/utils/fmgr/funcapi.c
index 7ac6f36abe..87cbb1d3e3 100644
--- a/src/backend/utils/fmgr/funcapi.c
+++ b/src/backend/utils/fmgr/funcapi.c
@@ -56,15 +56,6 @@ static bool resolve_polymorphic_tupdesc(TupleDesc tupdesc,
 static TypeFuncClass get_type_func_class(Oid typid, Oid *base_typeid);
 
 
-/*
- * Compatibility function for v15.
- */
-void
-SetSingleFuncCall(FunctionCallInfo fcinfo, bits32 flags)
-{
-	InitMaterializedSRF(fcinfo, flags);
-}
-
 /*
  * InitMaterializedSRF
  *
diff --git a/src/include/funcapi.h b/src/include/funcapi.h
index 8aed8dccaf..277e305765 100644
--- a/src/include/funcapi.h
+++ b/src/include/funcapi.h
@@ -297,11 +297,6 @@ HeapTupleGetDatum(const HeapTupleData *tuple)
 											 * BlessTupleDesc(). */
 extern void InitMaterializedSRF(FunctionCallInfo fcinfo, bits32 flags);
 
-/* Compatibility declarations, for v15 */
-#define SRF_SINGLE_USE_EXPECTED MAT_SRF_USE_EXPECTED_DESC
-#define SRF_SINGLE_BLESS		MAT_SRF_BLESS
-extern void SetSingleFuncCall(FunctionCallInfo fcinfo, bits32 flags);
-
 extern FuncCallContext *init_MultiFuncCall(PG_FUNCTION_ARGS);
 extern FuncCallContext *per_MultiFuncCall(PG_FUNCTION_ARGS);
 extern void end_MultiFuncCall(PG_FUNCTION_ARGS, FuncCallContext *funcctx);