diff --git a/src/testdir/Make_os2.mak b/src/testdir/Make_os2.mak
index cbf0a84..e6696d8 100644
--- a/src/testdir/Make_os2.mak
+++ b/src/testdir/Make_os2.mak
@@ -25,7 +25,8 @@
 		test43.out test44.out test45.out test46.out test47.out \
 		test48.out test51.out test53.out test54.out test55.out \
 		test56.out test57.out test58.out test59.out test60.out \
-		test61.out test62.out test63.out test64.out test65.out
+		test61.out test62.out test63.out test64.out test65.out \
+		test66.out
 
 .SUFFIXES: .in .out