diff --git a/micrometer-core/src/main/java/io/micrometer/core/instrument/logging/LoggingMeterRegistry.java b/micrometer-core/src/main/java/io/micrometer/core/instrument/logging/LoggingMeterRegistry.java
index 8e3b5a85ad..8127731baf 100644
--- a/micrometer-core/src/main/java/io/micrometer/core/instrument/logging/LoggingMeterRegistry.java
+++ b/micrometer-core/src/main/java/io/micrometer/core/instrument/logging/LoggingMeterRegistry.java
@@ -217,7 +217,7 @@ String value(double value) {
         // see https://stackoverflow.com/a/3758880/510017
         String humanReadableByteCount(double bytes) {
             int unit = 1024;
-            if (bytes < unit) return decimalOrNan(bytes) + " B";
+            if (bytes < unit || Double.isNaN(bytes)) return decimalOrNan(bytes) + " B";
             int exp = (int) (Math.log(bytes) / Math.log(unit));
             String pre = "KMGTPE".charAt(exp - 1) + "i";
             return decimalOrNan(bytes / Math.pow(unit, exp)) + " " + pre + "B";
diff --git a/micrometer-core/src/test/java/io/micrometer/core/instrument/logging/LoggingMeterRegistryTest.java b/micrometer-core/src/test/java/io/micrometer/core/instrument/logging/LoggingMeterRegistryTest.java
index 1d42eb1cb2..7f65b77fe0 100644
--- a/micrometer-core/src/test/java/io/micrometer/core/instrument/logging/LoggingMeterRegistryTest.java
+++ b/micrometer-core/src/test/java/io/micrometer/core/instrument/logging/LoggingMeterRegistryTest.java
@@ -60,6 +60,7 @@ void humanReadableByteCount() {
                 .baseUnit(BaseUnits.BYTES)
                 .register(registry));
 
+        assertThat(printer.humanReadableBaseUnit(Double.NaN)).isEqualTo("NaN B");
         assertThat(printer.humanReadableBaseUnit(1.0)).isEqualTo("1 B");
         assertThat(printer.humanReadableBaseUnit(1024)).isEqualTo("1 KiB");
         assertThat(printer.humanReadableBaseUnit(1024 * 1024 * 2.5678976654)).isEqualTo("2.567898 MiB");