Index: tools/flowmon.cc
--- tools/flowmon.cc.orig
+++ tools/flowmon.cc
@@ -166,8 +166,8 @@ Tagger::fformat(Flow* f)
 {
         double now = Scheduler::instance().clock();
         sprintf(wrk_, "%8.3f %d %d %d %d %d %d "
-		STRTOI64_FMTSTR" "STRTOI64_FMTSTR" %d %d "
-		STRTOI64_FMTSTR" "STRTOI64_FMTSTR" %d %d %d %d %d %d %d",
+		STRTOI64_FMTSTR " " STRTOI64_FMTSTR " %d %d "
+		STRTOI64_FMTSTR " " STRTOI64_FMTSTR " %d %d %d %d %d %d %d",
                 now,            // 1: time
                 f->flowid(),    // 2: flowid
                 0,              // 3: category