diff --git a/common/rfb/Congestion.h b/common/rfb/Congestion.h
index 2bea5da..5feea65 100644
--- a/common/rfb/Congestion.h
+++ b/common/rfb/Congestion.h
@@ -61,6 +61,7 @@
 
     unsigned baseRTT;
     unsigned congWindow;
+    bool inSlowStart;
 
     struct RTTInfo {
       struct timeval tv;