diff --git a/src/daqd/comm.y b/src/daqd/comm.y
index bf2af78715d6d4f96328f20b728e6640a03a6bf9..54077c6ade916a65c657b70112ec6ccf5108c13f 100644
--- a/src/daqd/comm.y
+++ b/src/daqd/comm.y
@@ -2039,7 +2039,7 @@ status_channels_bailout:
 	   sem_wait (&daqd.trender.trender_sem);
 	   sem_post (&daqd.trender.trender_sem);
 	}
-	| START TREND OptionalIntnum {
+	| START TREND OptionalIntnum OptionalIntnum {
 		AUTH_CHECK(((my_lexer *)lexer));
 		ostream *yyout = ((my_lexer *)lexer)->get_yyout ();
 
@@ -2049,7 +2049,7 @@ status_channels_bailout:
 		else if (! daqd.trender.num_channels)
 		  *yyout << "there are no trend channels configured" << endl;
 		else {
-		  if (!daqd.trender.start_trend (yyout, 1, 1, 60, 60, $3)) {
+		  if (!daqd.trender.start_trend (yyout, 1, 1, $3? $3: 60, $4? $4: 60)) {
 		    system_log(1, "trender started");
 		  }
 		}
diff --git a/src/daqd/trend.cc b/src/daqd/trend.cc
index b645edffd05758833ae17e3e768cb8b2157e0009..3c8787e18c8dfa6aa0cc899e6cee5ae1d118664c 100644
--- a/src/daqd/trend.cc
+++ b/src/daqd/trend.cc
@@ -353,7 +353,7 @@ trender_c::minute_framer ()
 
       file_gps = file_prop.gps;
       file_gps_n = file_prop.gps_n;
-      dir_num = minute_fsd.getDirFileNames (file_gps, _tmpf, tmpf, 1, 3600 );
+      dir_num = minute_fsd.getDirFileNames (file_gps, _tmpf, tmpf, 1, frame_length_blocks * 60 );
 
       int fd = creat (_tmpf, 0644);
       if (fd < 0) {
@@ -779,7 +779,7 @@ trender_c::framer ()
 
       file_gps = file_prop.gps;
       file_gps_n = file_prop.gps_n;
-      dir_num = fsd.getDirFileNames (file_gps, _tmpf, tmpf, 1, 60);
+      dir_num = fsd.getDirFileNames (file_gps, _tmpf, tmpf, 1, frame_length_blocks);
 
       int fd = creat (_tmpf, 0644);
       if (fd < 0) {
@@ -1239,7 +1239,7 @@ trender_c::trend_worker ()
 
 int 
 trender_c::start_trend (ostream *yyout, int pframes_per_file, int pminute_frames_per_file,
-			int ptrend_buffer_blocks, int pminute_trend_buffer_blocks, int pnum_threads = 1)
+			int ptrend_buffer_blocks, int pminute_trend_buffer_blocks)
 {
   if (this -> tb) {
     *yyout << "trend is already running" << endl;
@@ -1253,7 +1253,6 @@ trender_c::start_trend (ostream *yyout, int pframes_per_file, int pminute_frames
   minute_frames_per_file = pminute_frames_per_file;
   trend_buffer_blocks = ptrend_buffer_blocks;
   minute_trend_buffer_blocks = pminute_trend_buffer_blocks;
-  num_threads = pnum_threads;
 
   // Allocate trend circular buffer
   {
diff --git a/src/daqd/trend.hh b/src/daqd/trend.hh
index d338556efbbd6c7251274184a2e472178ad23e23..fdfebc4b7ead7aaaa4f08bcce2eab3d369d43522 100644
--- a/src/daqd/trend.hh
+++ b/src/daqd/trend.hh
@@ -81,7 +81,7 @@ public:
     frames_per_file (1), trend_buffer_blocks (60), profile ((char *)"trend"),
     		 profile_mt((char *)"mt"),
 		 fsd (60), minute_fsd (3600), raw_minute_trend_saving_period (2),
-		 num_threads (1), worker_first_channel (0),
+		 worker_first_channel (0),
 		 trend_worker_nb (0), worker_busy (0)
     {
       sem_init (&minute_frame_saver_sem, 0, 1);
@@ -166,7 +166,7 @@ public:
 
   int block_size; // circ buffer data block size (sum of the sizes of the configured channels)
 
-  int start_trend (ostream *, int, int, int, int, int);
+  int start_trend (ostream *, int, int, int, int);
   sem_t trender_sem;
   int start_trend_saver (ostream *);
   int start_minute_trend_saver (ostream *);
@@ -197,8 +197,6 @@ public:
   profile_c profile_mt; // profile on minute trend circular buffer.
   unsigned int raw_minute_trend_saving_period;
 
-  unsigned int num_threads;
-  
   // worked thread does processing from this channel until the last one
   unsigned int worker_first_channel;