diff --git a/src/testdir/Make_os2.mak b/src/testdir/Make_os2.mak
index 9a918d4..d930926 100644
--- a/src/testdir/Make_os2.mak
+++ b/src/testdir/Make_os2.mak
@@ -31,7 +31,7 @@
 		test66.out test67.out test68.out test69.out test70.out \
 		test71.out test72.out test73.out test74.out test75.out \
 		test76.out test77.out test78.out test79.out test80.out \
-		test81.out test82.out test83.out test84.out
+		test81.out test82.out test83.out test84.out test88.out
 
 .SUFFIXES: .in .out