diff --git a/appl/popper/popper.h b/appl/popper/popper.h
index eb0d1c19f..d78e7e168 100644
--- a/appl/popper/popper.h
+++ b/appl/popper/popper.h
@@ -273,6 +273,8 @@ typedef struct  {                               /*  POP parameter block */
 #ifdef OTP
     OtpContext		otp_ctx;		/*  OTP context */
 #endif
+    unsigned int	flags;
+#define POP_FLAG_CAPA 1
 } POP;
 
 typedef struct {                                /*  State information for