diff --git a/src/halfvec.c b/src/halfvec.c
index 3ef1d46..4515daf 100644
--- a/src/halfvec.c
+++ b/src/halfvec.c
@@ -410,8 +410,8 @@ halfvec_send(PG_FUNCTION_ARGS)
 	StringInfoData buf;
 
 	pq_begintypsend(&buf);
-	pq_sendint16(&buf, vec->dim);
-	pq_sendint16(&buf, vec->unused);
+	pq_sendint16(&buf, (uint16) vec->dim);
+	pq_sendint16(&buf, (uint16) vec->unused);
 	for (int i = 0; i < vec->dim; i++)
 		pq_sendhalf(&buf, vec->x[i]);
 
diff --git a/src/sparsevec.c b/src/sparsevec.c
index 4d8c8b3..ef42146 100644
--- a/src/sparsevec.c
+++ b/src/sparsevec.c
@@ -569,13 +569,13 @@ sparsevec_send(PG_FUNCTION_ARGS)
 	StringInfoData buf;
 
 	pq_begintypsend(&buf);
-	pq_sendint32(&buf, svec->dim);
-	pq_sendint32(&buf, svec->nnz);
-	pq_sendint32(&buf, svec->unused);
+	pq_sendint32(&buf, (uint32) svec->dim);
+	pq_sendint32(&buf, (uint32) svec->nnz);
+	pq_sendint32(&buf, (uint32) svec->unused);
 
 	/* Binary representation uses zero-based numbering for indices */
 	for (int i = 0; i < svec->nnz; i++)
-		pq_sendint32(&buf, svec->indices[i]);
+		pq_sendint32(&buf, (uint32) svec->indices[i]);
 
 	for (int i = 0; i < svec->nnz; i++)
 		pq_sendfloat4(&buf, values[i]);
diff --git a/src/vector.c b/src/vector.c
index 813ce22..296a8f3 100644
--- a/src/vector.c
+++ b/src/vector.c
@@ -413,8 +413,8 @@ vector_send(PG_FUNCTION_ARGS)
 	StringInfoData buf;
 
 	pq_begintypsend(&buf);
-	pq_sendint16(&buf, vec->dim);
-	pq_sendint16(&buf, vec->unused);
+	pq_sendint16(&buf, (uint16) vec->dim);
+	pq_sendint16(&buf, (uint16) vec->unused);
 	for (int i = 0; i < vec->dim; i++)
 		pq_sendfloat4(&buf, vec->x[i]);