diff --git a/ChangeLog b/ChangeLog
index 8ff3e18a..aae1834d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -72,6 +72,7 @@
 - added im__colour_difference(), colour ops now work on any image format
 - added im_col_display_get_table(), so display tables are now shared by name
 - added im__colour_unary()
+- drop "set" postfix from names, so "insert" can now take a vector of positions
 
 25/3/09 started 7.18.0
 - revised version numbers
diff --git a/tools/iofuncs/vips.c b/tools/iofuncs/vips.c
index 74e55ad5..c405aa04 100644
--- a/tools/iofuncs/vips.c
+++ b/tools/iofuncs/vips.c
@@ -469,6 +469,11 @@ c2cpp_name( const char *in, char *out )
 	 */
 	if( ispostfix( "tra", out ) )
 		out[strlen( out ) - 3] = '\0';
+
+	/* Drop "set" postfix (eg. so im_insertset becomes insert).
+	 */
+	if( ispostfix( "set", out ) )
+		out[strlen( out ) - 3] = '\0';
 }
 
 /* Print prototype for a function (ie. will be followed by code).