diff --git a/test/expected/sparsevec_functions.out b/test/expected/sparsevec_functions.out
index c4ab538..21667ac 100644
--- a/test/expected/sparsevec_functions.out
+++ b/test/expected/sparsevec_functions.out
@@ -346,6 +346,12 @@ SELECT l1_distance('{1:1,3:3,5:5,7:7,9:9}/9'::sparsevec, '{2:2,4:4,6:6,8:8}/9');
           45
 (1 row)
 
+SELECT '{}/2'::sparsevec <+> '{1:3,2:4}/2';
+ ?column? 
+----------
+        7
+(1 row)
+
 SELECT l2_normalize('{1:3,2:4}/2'::sparsevec);
   l2_normalize   
 -----------------
diff --git a/test/sql/sparsevec_functions.sql b/test/sql/sparsevec_functions.sql
index 1e30c1e..813bd29 100644
--- a/test/sql/sparsevec_functions.sql
+++ b/test/sql/sparsevec_functions.sql
@@ -64,6 +64,7 @@ SELECT l1_distance('{1:1,2:2}/2'::sparsevec, '{1:3}/1');
 SELECT l1_distance('{1:3e38}/1'::sparsevec, '{1:-3e38}/1');
 SELECT l1_distance('{1:1,3:3,5:5,7:7}/8'::sparsevec, '{2:2,4:4,6:6,8:8}/8');
 SELECT l1_distance('{1:1,3:3,5:5,7:7,9:9}/9'::sparsevec, '{2:2,4:4,6:6,8:8}/9');
+SELECT '{}/2'::sparsevec <+> '{1:3,2:4}/2';
 
 SELECT l2_normalize('{1:3,2:4}/2'::sparsevec);
 SELECT l2_normalize('{1:3}/2'::sparsevec);