diff --git a/lib/rrd_utils.ml b/lib/rrd_utils.ml
index 7b0ac16..f79f166 100644
--- a/lib/rrd_utils.ml
+++ b/lib/rrd_utils.ml
@@ -86,7 +86,7 @@ let rec setify = function
 let f_to_s f =
   match classify_float f with
   | FP_normal | FP_subnormal ->
-      Printf.sprintf "%0.4f" f
+      Printf.sprintf "%0.4g" f
   | FP_nan ->
       "NaN"
   | FP_infinite ->