diff --git a/test/tst_multifile.py b/test/tst_multifile.py
index 9fccbf537..5b8d77467 100644
--- a/test/tst_multifile.py
+++ b/test/tst_multifile.py
@@ -5,7 +5,7 @@
 from numpy import ma
 import tempfile, unittest, os, datetime
 
-nx=100; ydim=5; zdim=1
+nx=100; ydim=5; zdim=10
 nfiles = 10
 ninc = nx/nfiles
 files = [tempfile.NamedTemporaryFile(suffix='.nc', delete=False).name for nfile in range(nfiles)]
diff --git a/test/tst_multifile2.py b/test/tst_multifile2.py
index d919d7a75..c16ed9ab6 100644
--- a/test/tst_multifile2.py
+++ b/test/tst_multifile2.py
@@ -5,7 +5,7 @@
 from numpy import ma
 import tempfile, unittest, os, datetime
 
-nx=100; ydim=5; zdim=1
+nx=100; ydim=5; zdim=10
 nfiles = 10
 ninc = nx/nfiles
 files = [tempfile.NamedTemporaryFile(suffix='.nc', delete=False).name for nfile in range(nfiles)]