diff --git a/doc/src/sgml/install.sgml b/doc/src/sgml/install.sgml
index 206ba7085f..c1023a5bec 100644
--- a/doc/src/sgml/install.sgml
+++ b/doc/src/sgml/install.sgml
@@ -730,8 +730,7 @@ pg_id: can't load library 'libpq.so'
        <ProgramListing>
 	LC_COLLATE=C
 	LC_CTYPE=C
-	LC_COLLATE=C
-	export LC_COLLATE LC_CTYPE LC_COLLATE
+	export LC_COLLATE LC_CTYPE
        </ProgramListing>
        
        <ProgramListing>