diff --git a/micrometer-core/src/main/java/io/micrometer/core/instrument/MeterRegistry.java b/micrometer-core/src/main/java/io/micrometer/core/instrument/MeterRegistry.java
index d532eb4bf2..88d1a4b9af 100644
--- a/micrometer-core/src/main/java/io/micrometer/core/instrument/MeterRegistry.java
+++ b/micrometer-core/src/main/java/io/micrometer/core/instrument/MeterRegistry.java
@@ -56,7 +56,7 @@ protected MeterRegistry(Clock clock) {
         this.clock = clock;
     }
 
-    private Map<Id, Meter> meterMap = Collections.emptyMap();
+    private volatile Map<Id, Meter> meterMap = Collections.emptyMap();
     private final List<MeterFilter> filters = new ArrayList<>();
 
     /**