diff --git a/global_structures.h b/global_structures.h
index 220e2f058..ad1c7acd4 100644
--- a/global_structures.h
+++ b/global_structures.h
@@ -205,6 +205,26 @@ struct FingerPrintDB {
   ~FingerPrintDB();
 };
 
+/* Based on TCP congestion control techniques from RFC2581. */
+struct ultra_timing_vals {
+  double cwnd; /* Congestion window - in probes */
+  int ssthresh; /* The threshold above which mode is changed from slow start
+		   to congestion avoidance */
+  /* The number of replies we would expect if every probe produced a reply. This
+     is almost like the total number of probes sent but it is not incremented
+     until a reply is received or a probe times out. This and
+     num_replies_received are used to scale congestion window increments. */
+  int num_replies_expected;
+  /* The number of replies we've received to probes of any type. */
+  int num_replies_received;
+  /* Number of updates to this timing structure (generally packet receipts). */
+  int num_updates;
+  /* Last time values were adjusted for a drop (you usually only want
+     to adjust again based on probes sent after that adjustment so a
+     sudden batch of drops doesn't destroy timing.  Init to now */
+  struct timeval last_drop;
+};
+
 struct timeout_info {
   int srtt; /* Smoothed rtt estimate (microseconds) */
   int rttvar; /* Rout trip time variance */
diff --git a/scan_engine.cc b/scan_engine.cc
index 5530f4998..270d26a93 100644
--- a/scan_engine.cc
+++ b/scan_engine.cc
@@ -145,27 +145,6 @@ struct ultra_scan_performance_vars {
   int tryno_cap; /* The maximum trynumber (starts at zero) allowed */
 };
 
-/* Some of the algorithms used here are TCP congestion control
-   techniques from RFC2581. */
-struct ultra_timing_vals {
-  double cwnd; /* Congestion window - in probes */
-  int ssthresh; /* The threshold above which mode is changed from slow start
-		   to congestion avoidance */
-  /* The number of replies we would expect if every probe produced a reply. This
-     is almost like the total number of probes sent but it is not incremented
-     until a reply is received or a probe times out. This and
-     num_replies_received are used to scale congestion window increments. */
-  int num_replies_expected;
-  /* The number of replies we've received to probes of any type. */
-  int num_replies_received;
-  /* Number of updates to this timing structure (generally packet receipts). */
-  int num_updates;
-  /* Last time values were adjusted for a drop (you usually only want
-     to adjust again based on probes sent after that adjustment so a
-     sudden batch of drops doesn't destroy timing.  Init to now */
-  struct timeval last_drop; 
-};
-
 static const char *pspectype2ascii(int type) {
   switch(type) {
   case PS_NONE: