diff --git a/sql/vector.sql b/sql/vector.sql
index 190c38e..65a60a4 100644
--- a/sql/vector.sql
+++ b/sql/vector.sql
@@ -34,8 +34,8 @@ CREATE TYPE vector (
 CREATE FUNCTION l2_distance(vector, vector) RETURNS float8
 	AS 'MODULE_PATHNAME' LANGUAGE C IMMUTABLE STRICT PARALLEL SAFE;
 
-CREATE FUNCTION float4_l2_distance(float4[], float4[]) RETURNS float8
-	AS 'MODULE_PATHNAME' LANGUAGE C IMMUTABLE STRICT PARALLEL SAFE;
+CREATE FUNCTION l2_distance(float4[], float4[]) RETURNS float8
+	AS 'MODULE_PATHNAME', 'float4_l2_distance' LANGUAGE C IMMUTABLE STRICT PARALLEL SAFE;
 
 CREATE FUNCTION inner_product(vector, vector) RETURNS float8
 	AS 'MODULE_PATHNAME' LANGUAGE C IMMUTABLE STRICT PARALLEL SAFE;
@@ -171,7 +171,7 @@ CREATE OPERATOR <-> (
 );
 
 CREATE OPERATOR <-> (
-	LEFTARG = float4[], RIGHTARG = float4[], PROCEDURE = float4_l2_distance,
+	LEFTARG = float4[], RIGHTARG = float4[], PROCEDURE = l2_distance,
 	COMMUTATOR = '<->'
 );
 
diff --git a/test/expected/functions.out b/test/expected/functions.out
index 2840688..8366e8e 100644
--- a/test/expected/functions.out
+++ b/test/expected/functions.out
@@ -54,21 +54,21 @@ SELECT vector_norm('[3e37,4e37]')::real;
        5e+37
 (1 row)
 
-SELECT l2_distance('[0,0]', '[3,4]');
+SELECT l2_distance('[0,0]'::vector, '[3,4]');
  l2_distance 
 -------------
            5
 (1 row)
 
-SELECT l2_distance('[0,0]', '[0,1]');
+SELECT l2_distance('[0,0]'::vector, '[0,1]');
  l2_distance 
 -------------
            1
 (1 row)
 
-SELECT l2_distance('[1,2]', '[3]');
+SELECT l2_distance('[1,2]'::vector, '[3]');
 ERROR:  different vector dimensions 2 and 1
-SELECT l2_distance('[3e38]', '[-3e38]');
+SELECT l2_distance('[3e38]'::vector, '[-3e38]');
  l2_distance 
 -------------
     Infinity
diff --git a/test/sql/functions.sql b/test/sql/functions.sql
index 914df36..b10a660 100644
--- a/test/sql/functions.sql
+++ b/test/sql/functions.sql
@@ -13,10 +13,10 @@ SELECT vector_norm('[3,4]');
 SELECT vector_norm('[0,1]');
 SELECT vector_norm('[3e37,4e37]')::real;
 
-SELECT l2_distance('[0,0]', '[3,4]');
-SELECT l2_distance('[0,0]', '[0,1]');
-SELECT l2_distance('[1,2]', '[3]');
-SELECT l2_distance('[3e38]', '[-3e38]');
+SELECT l2_distance('[0,0]'::vector, '[3,4]');
+SELECT l2_distance('[0,0]'::vector, '[0,1]');
+SELECT l2_distance('[1,2]'::vector, '[3]');
+SELECT l2_distance('[3e38]'::vector, '[-3e38]');
 
 SELECT inner_product('[1,2]', '[3,4]');
 SELECT inner_product('[1,2]', '[3]');