diff --git a/tests/Makefile.am b/tests/Makefile.am
index 8a6408e6..a8935268 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -1,4 +1,4 @@
-SUBDIRS = . core forces hmc solver debug smearing 
+SUBDIRS = . core forces hmc solver debug smearing IO
 
 if BUILD_CHROMA_REGRESSION
   SUBDIRS+= qdpxx