diff --git a/src/testdir/Make_os2.mak b/src/testdir/Make_os2.mak
index af58202..f3ce50b 100644
--- a/src/testdir/Make_os2.mak
+++ b/src/testdir/Make_os2.mak
@@ -23,7 +23,7 @@
 		test33.out test34.out test35.out test36.out test37.out \
 		test38.out test39.out test40.out test41.out test42.out \
 		test43.out test44.out test45.out test46.out test47.out \
-		test48.out test51.out
+		test48.out test51.out test53.out
 
 .SUFFIXES: .in .out