diff --git a/owlps-aggregator/Makefile b/owlps-aggregator/Makefile
index 8915044..f5bf98a 100644
--- a/owlps-aggregator/Makefile
+++ b/owlps-aggregator/Makefile
@@ -25,7 +25,7 @@ CFLAGS = -O2 -Wall -Wextra -Wstrict-prototypes -O -I$(LIBOWLPS_DIR)
 DEPFLAGS=-MMD
 XCFLAGS=$(CFLAGS) $(DEPFLAGS) $(WARN) $(HEADERS)
 PICFLAG=-fPIC
-OWLPSFLAGS = -D USE_TIMESTAMP
+#OWLPSFLAGS =
 LIBS = -pthread -lconfuse -L$(LIBOWLPS_DIR) -lowlps
 LDFLAGS = $(LIBS) $(OWLPSFLAGS)
 
diff --git a/owlps-aggregator/owlps-aggregator.h b/owlps-aggregator/owlps-aggregator.h
index 2bf6bcc..b4bba4b 100644
--- a/owlps-aggregator/owlps-aggregator.h
+++ b/owlps-aggregator/owlps-aggregator.h
@@ -9,9 +9,6 @@
 
 #define DEBUG
 
-// Uncomment to output the timestamp on each line of the output file:
-//#define USE_TIMESTAMP
-
 
 /* Arguments & program configuration */
 #define OPTIONS "Aa:c:C:f:hi:k:K:l:o:p:t:v" // getopt string
diff --git a/owlps-aggregator/owlps-aggregatord.c b/owlps-aggregator/owlps-aggregatord.c
index fcbe025..7e699f4 100644
--- a/owlps-aggregator/owlps-aggregatord.c
+++ b/owlps-aggregator/owlps-aggregatord.c
@@ -477,9 +477,7 @@ void* monitor_requests(void *NULL_value)
   FILE *fd = NULL ;
   char mac_str[OWL_ETHER_ADDR_STRLEN] ;
   uint_fast32_t sub ; // owl_time_elapsed_ms() result
-#ifdef USE_TIMESTAMP
   char request_time_str[OWL_TIMESTAMP_STR_LEN] ;
-#endif // USE_TIMESTAMP
 
   uint_fast32_t aggregate_timeout =
     cfg_getint(cfg, "aggregate_timeout") ;
@@ -553,12 +551,10 @@ void* monitor_requests(void *NULL_value)
                   // Print request type to the output file
                   fprintf(fd, "%"PRIu8";", request_ptr->type) ;
 
-#ifdef USE_TIMESTAMP
                   // Print request mobile timestamp to the output file
                   owl_timestamp_to_string(request_time_str,
                                           request_ptr->request_time) ;
                   fprintf(fd, "%s;", request_time_str) ;
-#endif // USE_TIMESTAMP
 
                   // Print request info to the output file
                   fprintf(fd, "%0.2f;%0.2f;%0.2f;%hhd",