diff --git a/armsrc/Standalone/hf_colin.h b/armsrc/Standalone/hf_colin.h
index 8c8e391e1..9068e2d09 100644
--- a/armsrc/Standalone/hf_colin.h
+++ b/armsrc/Standalone/hf_colin.h
@@ -22,6 +22,7 @@
 #include "iso14443a.h"
 #include "protocols.h"
 #include "util.h"
+#include "pmflash.h"
 #include "standalone.h" // standalone definitions
 #include <stdbool.h>    // for bool
 #include <stdio.h>