--- a/daemon/opd_stats.h
+++ b/daemon/opd_stats.h
@@ -19,6 +19,7 @@
 	OPD_PROCESS, /* nr. userspace samples */
 	OPD_NO_CTX, /* nr. samples lost due to not knowing if in the kernel or not */
 	OPD_LOST_KERNEL,  /* nr. kernel samples lost */
+	OPD_LOST_SAMPLEFILE, /**< nr samples for which sample file can't be opened */
 	OPD_DUMP_COUNT, /* nr. of times buffer is read */
 	OPD_DANGLING_CODE, /* nr. partial code notifications (buffer overflow */
 	OPD_MAX_STATS /* end of stats */