diff --git a/src/testdir/Make_os2.mak b/src/testdir/Make_os2.mak
index 3f63cec..4d3296c 100644
--- a/src/testdir/Make_os2.mak
+++ b/src/testdir/Make_os2.mak
@@ -24,7 +24,7 @@
 		test38.out test39.out test40.out test41.out test42.out \
 		test43.out test44.out test45.out test46.out test47.out \
 		test48.out test51.out test53.out test54.out test55.out \
-		test56.out
+		test56.out test57.out
 
 .SUFFIXES: .in .out