diff -r c1eed9867bf0 -r c8b2a408628b src/jdk.jfr/share/classes/jdk/jfr/internal/PlatformRecording.java
--- a/src/jdk.jfr/share/classes/jdk/jfr/internal/PlatformRecording.java	Thu Dec 13 10:25:50 2018 +0100
+++ b/src/jdk.jfr/share/classes/jdk/jfr/internal/PlatformRecording.java	Thu Dec 13 14:21:04 2018 +0100
@@ -123,7 +123,7 @@
                     options.add("maxage=" + Utils.formatTimespan(maxAge, ""));
                 }
                 if (maxSize != 0) {
-                    options.add("maxsize=" + Utils.formatBytes(maxSize, ""));
+                    options.add("maxsize=" + Utils.formatBytesCompact(maxSize));
                 }
                 if (dumpOnExit) {
                     options.add("dumponexit=true");