diff --git a/apps/aqhome-cgi/modules/devices/mdevices_vgraph.c b/apps/aqhome-cgi/modules/devices/mdevices_vgraph.c
index b8d35ca..fad25d3 100644
--- a/apps/aqhome-cgi/modules/devices/mdevices_vgraph.c
+++ b/apps/aqhome-cgi/modules/devices/mdevices_vgraph.c
@@ -363,13 +363,13 @@ const char *_getModifiersForPeriod(int period)
 {
   /* period */
   switch(period) {
-  case VALUEGRAPH_PERIOD_4H:  return "La5";
-  case VALUEGRAPH_PERIOD_1D:  return "La30";
-  case VALUEGRAPH_PERIOD_1W:  return "La240";
-  case VALUEGRAPH_PERIOD_1M:  return "La480";
-  case VALUEGRAPH_PERIOD_6M:  return "La720";
-  case VALUEGRAPH_PERIOD_12M: return "La1440";
-  default:                    return "La30";
+  case VALUEGRAPH_PERIOD_4H:  return "Lm5";
+  case VALUEGRAPH_PERIOD_1D:  return "Lm30";
+  case VALUEGRAPH_PERIOD_1W:  return "Lm240";
+  case VALUEGRAPH_PERIOD_1M:  return "Lm480";
+  case VALUEGRAPH_PERIOD_6M:  return "Lm720";
+  case VALUEGRAPH_PERIOD_12M: return "Lm1440";
+  default:                    return "Lm30";
   }
 }