diff --git a/config/config-mp/src/main/java/io/helidon/config/mp/SeConfig.java b/config/config-mp/src/main/java/io/helidon/config/mp/SeConfig.java
index d512bb8a9bb..3586a82399c 100644
--- a/config/config-mp/src/main/java/io/helidon/config/mp/SeConfig.java
+++ b/config/config-mp/src/main/java/io/helidon/config/mp/SeConfig.java
@@ -260,8 +260,12 @@ public ConfigValue<Map<String, String>> asMap() throws MissingValueException {
                     continue;
                 }
                 if (propertyName.startsWith(stringKey + ".")) {
-                    String noPrefix = propertyName.substring(stringPrefix.length());
-
+                    String noPrefix;
+                    if (stringPrefix.isEmpty()) {
+                        noPrefix = propertyName;
+                    } else {
+                        noPrefix = propertyName.substring(stringPrefix.length() + 1);
+                    }
                     children.put(noPrefix, delegate.getValue(propertyName, String.class));
                 }
             }
diff --git a/config/config-mp/src/test/java/io/helidon/config/mp/MpConfigTest.java b/config/config-mp/src/test/java/io/helidon/config/mp/MpConfigTest.java
index d00e6d3c5e1..fd3917b7cde 100644
--- a/config/config-mp/src/test/java/io/helidon/config/mp/MpConfigTest.java
+++ b/config/config-mp/src/test/java/io/helidon/config/mp/MpConfigTest.java
@@ -188,8 +188,14 @@ public void testSeConfigAsMap() {
                         "client.headers.0.name", "foo"
                 )))
                 .build();
-        Map<String, String> map = MpConfig.toHelidonConfig(mpConfig).get("client").asMap().orElse(Map.of());
+        io.helidon.config.Config seConfig = MpConfig.toHelidonConfig(mpConfig);
+        Map<String, String> map;
+
+        map = seConfig.get("client").asMap().orElse(Map.of());
         assertThat(map.get("client.headers.0.name"), is("foo"));
+
+        map = seConfig.get("client").detach().asMap().orElse(Map.of());
+        assertThat(map.get("headers.0.name"), is("foo"));
     }
 
     // Github issue #2206