diff --git a/acme4j-client/src/main/java/org/shredzone/acme4j/util/ClaimBuilder.java b/acme4j-client/src/main/java/org/shredzone/acme4j/util/ClaimBuilder.java
index 3d70d71e..27f346fd 100644
--- a/acme4j-client/src/main/java/org/shredzone/acme4j/util/ClaimBuilder.java
+++ b/acme4j-client/src/main/java/org/shredzone/acme4j/util/ClaimBuilder.java
@@ -15,6 +15,7 @@ package org.shredzone.acme4j.util;
 
 import java.security.Key;
 import java.security.PublicKey;
+import java.util.Collections;
 import java.util.Map;
 import java.util.TreeMap;
 
@@ -157,6 +158,13 @@ public class ClaimBuilder {
         return this;
     }
 
+    /**
+     * Returns a {@link Map} representation of the claims.
+     */
+    public Map<String, Object> toMap() {
+        return Collections.unmodifiableMap(data);
+    }
+
     /**
      * Returns a JSON representation of the claims.
      */
diff --git a/acme4j-client/src/test/java/org/shredzone/acme4j/util/ClaimBuilderTest.java b/acme4j-client/src/test/java/org/shredzone/acme4j/util/ClaimBuilderTest.java
index 0b992848..b6c8c725 100644
--- a/acme4j-client/src/test/java/org/shredzone/acme4j/util/ClaimBuilderTest.java
+++ b/acme4j-client/src/test/java/org/shredzone/acme4j/util/ClaimBuilderTest.java
@@ -62,6 +62,13 @@ public class ClaimBuilderTest {
         assertThat(res, is(sameInstance(cb)));
 
         assertThat(cb.toString(), is("{\"fooInt\":456,\"fooStr\":\"String\"}"));
+
+        Map<String, Object> map = cb.toMap();
+        assertThat(map.keySet(), hasSize(2));
+        assertThat(map, allOf(
+                hasEntry("fooInt", (Object) 456),
+                hasEntry("fooStr", (Object) "String")
+        ));
     }
 
     /**