diff --git a/sql/vector--0.6.0--0.6.1.sql b/sql/vector--0.6.0--0.6.1.sql
new file mode 100644
index 0000000..5081aae
--- /dev/null
+++ b/sql/vector--0.6.0--0.6.1.sql
@@ -0,0 +1,8 @@
+-- complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "ALTER EXTENSION vector UPDATE TO '0.6.1'" to load this file. \quit
+
+DROP OPERATOR - (vector, vector);
+
+CREATE OPERATOR - (
+	LEFTARG = vector, RIGHTARG = vector, PROCEDURE = vector_sub
+);
diff --git a/sql/vector.sql b/sql/vector.sql
index 4b17faa..dedbce1 100644
--- a/sql/vector.sql
+++ b/sql/vector.sql
@@ -180,8 +180,7 @@ CREATE OPERATOR + (
 );
 
 CREATE OPERATOR - (
-	LEFTARG = vector, RIGHTARG = vector, PROCEDURE = vector_sub,
-	COMMUTATOR = -
+	LEFTARG = vector, RIGHTARG = vector, PROCEDURE = vector_sub
 );
 
 CREATE OPERATOR * (