diff --git a/vlsisapd/src/openChams/src/vlsisapd/openChams/Circuit.h b/vlsisapd/src/openChams/src/vlsisapd/openChams/Circuit.h
index bee06c21..45f62dd0 100644
--- a/vlsisapd/src/openChams/src/vlsisapd/openChams/Circuit.h
+++ b/vlsisapd/src/openChams/src/vlsisapd/openChams/Circuit.h
@@ -12,6 +12,7 @@
 
 #include <vector>
 #include <map>
+#include <fstream>
 
 #include <libxml/parser.h>
 #include <libxml/tree.h>