diff --git a/tgt-pcb/footprint.cc b/tgt-pcb/footprint.cc
index d79530987..5ba01ab42 100644
--- a/tgt-pcb/footprint.cc
+++ b/tgt-pcb/footprint.cc
@@ -23,6 +23,7 @@
 # include "pcb_priv.h"
 # include "fp_api.h"
 # include <iostream>
+# include <cassert>
 
 using namespace std;