diff --git a/src/halfvec.c b/src/halfvec.c
index e638893..a6e785b 100644
--- a/src/halfvec.c
+++ b/src/halfvec.c
@@ -310,7 +310,7 @@ halfvec_out(PG_FUNCTION_ARGS)
 	 *
 	 * 3 bytes for [, ], and \0
 	 */
-	buf = (char *) palloc(add_size(mul_size(FLOAT_SHORTEST_DECIMAL_LEN, dim), 3));
+	buf = (char *) palloc(add_size(mul_size(FLOAT_SHORTEST_DECIMAL_LEN, (Size) dim), 3));
 	ptr = buf;
 
 	AppendChar(ptr, '[');
@@ -519,7 +519,7 @@ halfvec_to_float4(PG_FUNCTION_ARGS)
 	Datum	   *datums;
 	ArrayType  *result;
 
-	datums = palloc_array_checked(Datum, vec->dim);
+	datums = palloc_array_checked(Datum, (Size) vec->dim);
 
 	for (int i = 0; i < vec->dim; i++)
 		datums[i] = Float4GetDatum(HalfToFloat4(vec->x[i]));
diff --git a/src/hnswbuild.c b/src/hnswbuild.c
index 12799b2..0c90dac 100644
--- a/src/hnswbuild.c
+++ b/src/hnswbuild.c
@@ -102,7 +102,7 @@ CreateMetaPage(HnswBuildState * buildstate)
 	metap = HnswPageGetMeta(page);
 	metap->magicNumber = HNSW_MAGIC_NUMBER;
 	metap->version = HNSW_VERSION;
-	metap->dimensions = buildstate->dimensions;
+	metap->dimensions = (uint32) buildstate->dimensions;
 	metap->m = (uint16) buildstate->m;
 	metap->efConstruction = (uint16) buildstate->efConstruction;
 	metap->entryBlkno = InvalidBlockNumber;
@@ -934,7 +934,7 @@ HnswBeginParallel(HnswBuildState * buildstate, bool isconcurrent, int request)
 	char	   *hnswarea;
 	HnswLeader *hnswleader = palloc0_object(HnswLeader);
 	bool		leaderparticipates = true;
-	long		querylen;
+	Size		querylen;
 
 #ifdef DISABLE_LEADER_PARTICIPATION
 	leaderparticipates = false;
@@ -958,7 +958,7 @@ HnswBeginParallel(HnswBuildState * buildstate, bool isconcurrent, int request)
 	/* Leave space for other objects in shared memory */
 	/* Docker has a default limit of 64 MB for shm_size */
 	/* which happens to be the default value of maintenance_work_mem */
-	esthnswarea = mul_size(maintenance_work_mem, 1024);
+	esthnswarea = mul_size((Size) maintenance_work_mem, 1024);
 	estother = 3 * 1024 * 1024;
 	if (esthnswarea > estother)
 		esthnswarea -= estother;
diff --git a/src/hnswutils.c b/src/hnswutils.c
index 0cf1595..6e01dbc 100644
--- a/src/hnswutils.c
+++ b/src/hnswutils.c
@@ -831,7 +831,7 @@ HnswSearchLayer(char *base, HnswQuery * q, List *ep, int ef, int lc, Relation in
 	HnswNeighborArray *localNeighborhood = NULL;
 	Size		neighborhoodSize = 0;
 	int			lm = HnswGetLayerM(m, lc);
-	HnswUnvisited *unvisited = palloc_array_checked(HnswUnvisited, lm);
+	HnswUnvisited *unvisited = palloc_array_checked(HnswUnvisited, (Size) lm);
 	int			unvisitedLength;
 	bool		inMemory = index == NULL;
 
@@ -1074,7 +1074,7 @@ SelectNeighbors(char *base, List *c, int lm, HnswSupport * support, bool *closer
 	if (list_length(w) <= lm)
 		return w;
 
-	wd = palloc_array_checked(HnswCandidate *, list_length(w));
+	wd = palloc_array_checked(HnswCandidate *, (Size) list_length(w));
 
 	/* Ensure order of candidates is deterministic for closer caching */
 	if (sortCandidates)
diff --git a/src/ivfbuild.c b/src/ivfbuild.c
index ddd0fb5..cc7eebd 100644
--- a/src/ivfbuild.c
+++ b/src/ivfbuild.c
@@ -840,7 +840,7 @@ IvfflatBeginParallel(IvfflatBuildState * buildstate, bool isconcurrent, int requ
 	char	   *ivfcenters;
 	IvfflatLeader *ivfleader = palloc0_object(IvfflatLeader);
 	bool		leaderparticipates = true;
-	long		querylen;
+	Size		querylen;
 
 #ifdef DISABLE_LEADER_PARTICIPATION
 	leaderparticipates = false;
diff --git a/src/ivfflat.h b/src/ivfflat.h
index 66830b9..d8603a2 100644
--- a/src/ivfflat.h
+++ b/src/ivfflat.h
@@ -326,7 +326,7 @@ VectorArrayGet(VectorArray arr, int offset)
 	if (offset < 0 || offset >= arr->maxlen)
 		elog(ERROR, "index out of bounds");
 
-	return ((char *) arr->items) + (offset * arr->itemsize);
+	return ((char *) arr->items) + ((Size) offset * arr->itemsize);
 }
 
 static inline void
diff --git a/src/ivfkmeans.c b/src/ivfkmeans.c
index 2327a3c..423d927 100644
--- a/src/ivfkmeans.c
+++ b/src/ivfkmeans.c
@@ -25,7 +25,7 @@ InitCenters(Relation index, VectorArray samples, VectorArray centers, float *low
 {
 	FmgrInfo   *procinfo;
 	Oid			collation;
-	float	   *weight = palloc_array_checked(float, samples->length);
+	float	   *weight = palloc_array_checked(float, (Size) samples->length);
 	int			numCenters = centers->maxlen;
 	int			numSamples = samples->length;
 
diff --git a/src/ivfscan.c b/src/ivfscan.c
index c25f353..1408a8e 100644
--- a/src/ivfscan.c
+++ b/src/ivfscan.c
@@ -318,9 +318,9 @@ ivfflatbeginscan(Relation index, int nkeys, int norderbys)
 	so->bas = GetAccessStrategy(BAS_BULKREAD);
 
 	so->listQueue = pairingheap_allocate(CompareLists, scan);
-	so->listPages = palloc_array_checked(BlockNumber, maxProbes);
+	so->listPages = palloc_array_checked(BlockNumber, (Size) maxProbes);
 	so->listIndex = 0;
-	so->lists = palloc_array_checked(IvfflatScanList, maxProbes);
+	so->lists = palloc_array_checked(IvfflatScanList, (Size) maxProbes);
 
 	MemoryContextSwitchTo(oldCtx);
 
diff --git a/src/sparsevec.c b/src/sparsevec.c
index ab5a6bb..49283c9 100644
--- a/src/sparsevec.c
+++ b/src/sparsevec.c
@@ -392,7 +392,7 @@ sparsevec_in(PG_FUNCTION_ARGS)
 	CheckDim(dim);
 	CheckExpectedDim(typmod, dim);
 
-	qsort(elements, nnz, sizeof(SparseInputElement), CompareIndices);
+	qsort(elements, (Size) nnz, sizeof(SparseInputElement), CompareIndices);
 
 	result = InitSparseVector(dim, nnz);
 	rvalues = SPARSEVEC_VALUES(result);
@@ -449,7 +449,7 @@ sparsevec_out(PG_FUNCTION_ARGS)
 	 *
 	 * 4 bytes for {, }, /, and \0
 	 */
-	buf = (char *) palloc(add_size(mul_size(12 + FLOAT_SHORTEST_DECIMAL_LEN, sparsevec->nnz), 15));
+	buf = (char *) palloc(add_size(mul_size(12 + FLOAT_SHORTEST_DECIMAL_LEN, (Size) sparsevec->nnz), 15));
 	ptr = buf;
 
 	AppendChar(ptr, '{');
diff --git a/src/sparsevec.h b/src/sparsevec.h
index e8ab355..90c0d72 100644
--- a/src/sparsevec.h
+++ b/src/sparsevec.h
@@ -35,15 +35,15 @@ SPARSEVEC_SIZE(int nnz)
 {
 	Size		size = offsetof(SparseVector, indices);
 
-	size = add_size(size, mul_size(sizeof(int32), nnz));
-	size = add_size(size, mul_size(sizeof(float), nnz));
+	size = add_size(size, mul_size(sizeof(int32), (Size) nnz));
+	size = add_size(size, mul_size(sizeof(float), (Size) nnz));
 	return size;
 }
 
 static inline float *
 SPARSEVEC_VALUES(SparseVector * x)
 {
-	return (float *) (((char *) x) + offsetof(SparseVector, indices) + (x->nnz * sizeof(int32)));
+	return (float *) (((char *) x) + offsetof(SparseVector, indices) + ((Size) x->nnz * sizeof(int32)));
 }
 
 SparseVector *InitSparseVector(int dim, int nnz);
diff --git a/src/vector.c b/src/vector.c
index d0310dd..898aafb 100644
--- a/src/vector.c
+++ b/src/vector.c
@@ -305,7 +305,7 @@ vector_out(PG_FUNCTION_ARGS)
 	 *
 	 * 3 bytes for [, ], and \0
 	 */
-	buf = (char *) palloc(add_size(mul_size(FLOAT_SHORTEST_DECIMAL_LEN, dim), 3));
+	buf = (char *) palloc(add_size(mul_size(FLOAT_SHORTEST_DECIMAL_LEN, (Size) dim), 3));
 	ptr = buf;
 
 	AppendChar(ptr, '[');
@@ -522,7 +522,7 @@ vector_to_float4(PG_FUNCTION_ARGS)
 	Datum	   *datums;
 	ArrayType  *result;
 
-	datums = palloc_array_checked(Datum, vec->dim);
+	datums = palloc_array_checked(Datum, (Size) vec->dim);
 
 	for (int i = 0; i < vec->dim; i++)
 		datums[i] = Float4GetDatum(vec->x[i]);