diff --git a/CHANGELOG b/CHANGELOG
index 98e62e693..4950934b6 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,5 +1,11 @@
 # Nmap Changelog ($Id$); -*-text-*-
 
+o [GH#350] Fix an assertion failure due to floating point error in equality
+  comparison, which triggered mainly on OpenBSD:
+    assertion "diff <= interval" failed: file "timing.cc", line 440
+  This was reported earlier as [GH#472] but the assertion fixed there was a
+  different one. [David Carlier]
+
 o [Nping][GH#559] Fix Nping's ability to use Npcap on Windows. A privilege
   check was performed too late, so the Npcap loading code assumed the user had no
   rights. [Yang Luo, Daniel Miller]
diff --git a/timing.cc b/timing.cc
index 1c1be23ed..60a6a4086 100644
--- a/timing.cc
+++ b/timing.cc
@@ -437,7 +437,7 @@ void RateMeter::update(double amount, const struct timeval *now) {
     interval = MAX(current_rate_history, diff);
   else
     interval = TIMEVAL_SUBTRACT(*now, start_tv) / 1000000.0;
-  assert(diff <= interval);
+  assert(diff <= interval + std::numeric_limits<double>::epsilon());
   /* If we record an amount in the very same instant that the timer is started,
      there's no way to calculate meaningful rates. Ignore it. */
   if (interval == 0.0)