diff -r 9923b81a1d34 perf.py
--- a/perf.py	Wed Feb 03 14:19:18 2016 -0600
+++ b/perf.py	Thu Feb 18 16:26:45 2016 +0200
@@ -489,7 +489,11 @@
 
     def as_csv(self):
         # Min base, min changed
-        return ["%f" % self.min_base, "%f" % self.min_changed]
+        DECIMAL_THRESHOLD = 0.0001
+        if self.min_base < DECIMAL_THRESHOLD or self.min_changed < DECIMAL_THRESHOLD:
+            return ["%.10f" % self.min_base, "%.10f" % self.min_changed]
+        else:
+            return ["%f" % self.min_base, "%f" % self.min_changed]
 
 
 class BenchmarkError(BaseBenchmarkResult):