diff --git a/src/halfvec.h b/src/halfvec.h
index 80efa13..99ed3fd 100644
--- a/src/halfvec.h
+++ b/src/halfvec.h
@@ -45,6 +45,5 @@ typedef struct HalfVector
 
 HalfVector *InitHalfVector(int dim);
 int			halfvec_cmp_internal(HalfVector * a, HalfVector * b);
-PGDLLEXPORT Datum halfvec_l2_normalize(PG_FUNCTION_ARGS);
 
 #endif
diff --git a/src/hnswutils.c b/src/hnswutils.c
index b8dfd04..3773b1d 100644
--- a/src/hnswutils.c
+++ b/src/hnswutils.c
@@ -6,7 +6,6 @@
 #include "catalog/pg_type.h"
 #include "catalog/pg_type_d.h"
 #include "fmgr.h"
-#include "halfvec.h"
 #include "hnsw.h"
 #include "lib/pairingheap.h"
 #include "sparsevec.h"
@@ -15,7 +14,6 @@
 #include "utils/memdebug.h"
 #include "utils/rel.h"
 #include "utils/syscache.h"
-#include "vector.h"
 
 #if PG_VERSION_NUM >= 130000
 #include "common/hashfn.h"
diff --git a/src/ivfutils.c b/src/ivfutils.c
index cca3bd8..904ee39 100644
--- a/src/ivfutils.c
+++ b/src/ivfutils.c
@@ -3,10 +3,8 @@
 #include "access/generic_xlog.h"
 #include "catalog/pg_type.h"
 #include "fmgr.h"
-#include "halfvec.h"
 #include "ivfflat.h"
 #include "storage/bufmgr.h"
-#include "vector.h"
 #include "utils/syscache.h"
 
 /*
diff --git a/src/sparsevec.h b/src/sparsevec.h
index 52939bf..8d5009c 100644
--- a/src/sparsevec.h
+++ b/src/sparsevec.h
@@ -23,6 +23,5 @@ typedef struct SparseVector
 }			SparseVector;
 
 SparseVector *InitSparseVector(int dim, int nnz);
-PGDLLEXPORT Datum sparsevec_l2_normalize(PG_FUNCTION_ARGS);
 
 #endif