diff --git a/CHANGELOG.md b/CHANGELOG.md
index b40dc79..4d99402 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.8.6 (unreleased)
+
+- Fixed array to `sparsevec` cast not limiting to 16,000 non-zero elements
+
 ## 0.8.5 (2026-07-08)
 
 - Reduced memory usage for small tables for IVFFlat index builds
diff --git a/src/sparsevec.c b/src/sparsevec.c
index c6bc50d..2e99ce9 100644
--- a/src/sparsevec.c
+++ b/src/sparsevec.c
@@ -745,6 +745,7 @@ array_to_sparsevec(PG_FUNCTION_ARGS)
 				 errmsg("unsupported array type")));
 	}
 
+	CheckNnz(nnz, nelemsp);
 	result = InitSparseVector(nelemsp, nnz);
 	values = SPARSEVEC_VALUES(result);
 
diff --git a/test/expected/cast.out b/test/expected/cast.out
index 9087653..58c418a 100644
--- a/test/expected/cast.out
+++ b/test/expected/cast.out
@@ -270,6 +270,8 @@ SELECT array_to_vector(array_agg(n), 16001, false) FROM generate_series(1, 16001
 ERROR:  vector cannot have more than 16000 dimensions
 SELECT array_agg(n)::halfvec FROM generate_series(1, 16001) n;
 ERROR:  halfvec cannot have more than 16000 dimensions
+SELECT array_agg(n)::sparsevec FROM generate_series(1, 16001) n;
+ERROR:  sparsevec cannot have more than 16000 non-zero elements
 -- ensure no error
 SELECT ARRAY[1,2,3] = ARRAY[1,2,3];
  ?column? 
diff --git a/test/sql/cast.sql b/test/sql/cast.sql
index c35799e..07746ff 100644
--- a/test/sql/cast.sql
+++ b/test/sql/cast.sql
@@ -77,6 +77,7 @@ SELECT '{{1}}'::real[]::sparsevec;
 SELECT array_agg(n)::vector FROM generate_series(1, 16001) n;
 SELECT array_to_vector(array_agg(n), 16001, false) FROM generate_series(1, 16001) n;
 SELECT array_agg(n)::halfvec FROM generate_series(1, 16001) n;
+SELECT array_agg(n)::sparsevec FROM generate_series(1, 16001) n;
 
 -- ensure no error
 SELECT ARRAY[1,2,3] = ARRAY[1,2,3];