diff --git a/tests/cunit/Makefile.am b/tests/cunit/Makefile.am
index 16934faafeb..b6d13a9faeb 100644
--- a/tests/cunit/Makefile.am
+++ b/tests/cunit/Makefile.am
@@ -71,4 +71,4 @@ run_tests.sh : tests
 EXTRA_DIST = run_tests.sh
 
 # Clean up files produced during testing.
-CLEANFILES = *.nc *.log
+CLEANFILES = *.nc *.log decomp*.txt