diff --git a/micrometer-core/src/main/java/io/micrometer/core/instrument/config/NamingConvention.java b/micrometer-core/src/main/java/io/micrometer/core/instrument/config/NamingConvention.java
index 209e0accb8..cd18dfe093 100644
--- a/micrometer-core/src/main/java/io/micrometer/core/instrument/config/NamingConvention.java
+++ b/micrometer-core/src/main/java/io/micrometer/core/instrument/config/NamingConvention.java
@@ -57,7 +57,7 @@ public String tagKey(String key) {
         }
 
         private String toSnakeCase(String value) {
-            return Arrays.stream(value.split("\\.")).filter(Objects::nonNull).collect(Collectors.joining("_"));
+            return value.replace(".", "_");
         }
     };