diff --git a/src/drv_imap.c b/src/drv_imap.c
index a0013b1..43a7da0 100644
--- a/src/drv_imap.c
+++ b/src/drv_imap.c
@@ -824,6 +824,7 @@ parse_date( const char *str )
 	int hours, mins;
 	struct tm datetime;
 
+	memset( &datetime, 0, sizeof(datetime) );
 	if (!(end = strptime( str, "%d-%b-%Y %H:%M:%S ", &datetime )))
 		return -1;
 	if ((date = mktime( &datetime )) == -1)