diff --git a/armsrc/Standalone/hf_colin.h b/armsrc/Standalone/hf_colin.h
index 2b7879b6b..251620626 100644
--- a/armsrc/Standalone/hf_colin.h
+++ b/armsrc/Standalone/hf_colin.h
@@ -17,6 +17,7 @@
 #define __HF_COLIN_H
 
 #include "proxmark3.h"
+#include "mifaresim.h"  // mifare1ksim
 #include "mifareutil.h"
 #include "iso14443a.h"
 #include "protocols.h"