diff --git a/implementation/src/main/java/io/smallrye/config/KeyMap.java b/implementation/src/main/java/io/smallrye/config/KeyMap.java
index df35f6611..2ea85c7db 100644
--- a/implementation/src/main/java/io/smallrye/config/KeyMap.java
+++ b/implementation/src/main/java/io/smallrye/config/KeyMap.java
@@ -4,7 +4,6 @@
 import java.util.HashMap;
 import java.util.IdentityHashMap;
 import java.util.Iterator;
-import java.util.Map;
 import java.util.Set;
 import java.util.function.BiFunction;
 import java.util.function.Function;
@@ -257,29 +256,4 @@ public StringBuilder toString(StringBuilder b) {
     public String toString() {
         return toString(new StringBuilder()).toString();
     }
-
-    public Map<String, V> toMap() {
-        final Map<String, V> map = new HashMap<>();
-        unwrap(this, "", map);
-        return map;
-    }
-
-    private void unwrap(KeyMap<V> keyMap, String key, Map<String, V> map) {
-        for (String path : keyMap.keySet()) {
-            final KeyMap<V> nested = keyMap.get(path);
-            final String nestedKey = key.length() == 0 ? path : key + "." + path;
-            if (nested.any != null) {
-                map.put(nestedKey + ".*", nested.any.getRootValue());
-                unwrap(nested.any, nestedKey + ".*", map);
-            }
-            if (!nested.hasRootValue()) {
-                unwrap(nested, nestedKey, map);
-            } else {
-                map.put(nestedKey, nested.getRootValue());
-                if (!nested.keySet().isEmpty()) {
-                    unwrap(nested, nestedKey, map);
-                }
-            }
-        }
-    }
 }
diff --git a/implementation/src/main/java/io/smallrye/config/KeyMapBackedConfigSource.java b/implementation/src/main/java/io/smallrye/config/KeyMapBackedConfigSource.java
index 0a24d1959..b985d5f27 100644
--- a/implementation/src/main/java/io/smallrye/config/KeyMapBackedConfigSource.java
+++ b/implementation/src/main/java/io/smallrye/config/KeyMapBackedConfigSource.java
@@ -1,12 +1,13 @@
 package io.smallrye.config;
 
+import java.util.Collections;
 import java.util.Map;
 
 import org.eclipse.microprofile.config.spi.ConfigSource;
 
 import io.smallrye.config.common.AbstractConfigSource;
 
-public abstract class KeyMapBackedConfigSource extends AbstractConfigSource {
+public class KeyMapBackedConfigSource extends AbstractConfigSource {
     private static final long serialVersionUID = 4378754290346888762L;
 
     private final KeyMap<String> properties;
@@ -23,7 +24,7 @@ public KeyMapBackedConfigSource(final String name, final int ordinal, final KeyM
 
     @Override
     public Map<String, String> getProperties() {
-        return properties.toMap();
+        return Collections.emptyMap();
     }
 
     @Override
diff --git a/implementation/src/main/java/io/smallrye/config/SmallRyeConfigBuilder.java b/implementation/src/main/java/io/smallrye/config/SmallRyeConfigBuilder.java
index e14c9b49e..dce4a71a6 100644
--- a/implementation/src/main/java/io/smallrye/config/SmallRyeConfigBuilder.java
+++ b/implementation/src/main/java/io/smallrye/config/SmallRyeConfigBuilder.java
@@ -333,19 +333,8 @@ public SmallRyeConfig build() {
         if (!defaultValues.isEmpty() || !mappingProvider.getDefaultValues().isEmpty()) {
             final KeyMap<String> mappingProviderDefaultValues = mappingProvider.getDefaultValues();
             defaultValues.forEach((key, value) -> mappingProviderDefaultValues.findOrAdd(key).putRootValue(value));
-            withSources(new KeyMapBackedConfigSource("DefaultValuesConfigSource", mappingProviderDefaultValues) {
-                private static final long serialVersionUID = 7847969724478280439L;
-
-                @Override
-                public Map<String, String> getProperties() {
-                    return new HashMap<>();
-                }
-
-                @Override
-                public int getOrdinal() {
-                    return Integer.MIN_VALUE;
-                }
-            });
+            withSources(
+                    new KeyMapBackedConfigSource("DefaultValuesConfigSource", Integer.MIN_VALUE, mappingProviderDefaultValues));
         }
 
         try {
diff --git a/implementation/src/test/java/io/smallrye/config/KeyMapBackedConfigSourceTest.java b/implementation/src/test/java/io/smallrye/config/KeyMapBackedConfigSourceTest.java
index 7b8272ba6..6ce693a26 100644
--- a/implementation/src/test/java/io/smallrye/config/KeyMapBackedConfigSourceTest.java
+++ b/implementation/src/test/java/io/smallrye/config/KeyMapBackedConfigSourceTest.java
@@ -8,7 +8,6 @@
 import org.junit.jupiter.api.Test;
 
 class KeyMapBackedConfigSourceTest {
-
     @Test
     void getProperties() {
         KeyMap<String> map = new KeyMap<>();
@@ -17,12 +16,9 @@ void getProperties() {
         map.findOrAdd("root.foo.bar.*").putRootValue("baz");
         map.findOrAdd("root.foo.bar.*.baz").putRootValue("anything");
 
-        final ConfigSource source = getSource(map);
-        final Map<String, String> properties = source.getProperties();
-        assertTrue(properties.containsKey("root.foo"));
-        assertTrue(properties.containsKey("root.foo.bar"));
-        assertTrue(properties.containsKey("root.foo.bar.*"));
-        assertTrue(properties.containsKey("root.foo.bar.*.baz"));
+        ConfigSource source = getSource(map);
+        Map<String, String> properties = source.getProperties();
+        assertTrue(properties.isEmpty());
     }
 
     @Test
@@ -33,7 +29,7 @@ void getValue() {
         map.findOrAdd("root.foo.bar.*").putRootValue("baz");
         map.findOrAdd("root.foo.bar.*.baz").putRootValue("anything");
 
-        final ConfigSource source = getSource(map);
+        ConfigSource source = getSource(map);
         assertEquals("bar", source.getValue("root.foo"));
         assertEquals("baz", source.getValue("root.foo.bar"));
         assertEquals("baz", source.getValue("root.foo.bar.x"));
@@ -45,7 +41,6 @@ void getValue() {
     }
 
     private ConfigSource getSource(final KeyMap<String> properties) {
-        return new KeyMapBackedConfigSource("test", 0, properties) {
-        };
+        return new KeyMapBackedConfigSource("test", 0, properties);
     }
 }
diff --git a/implementation/src/test/java/io/smallrye/config/KeyMapTest.java b/implementation/src/test/java/io/smallrye/config/KeyMapTest.java
index 2e200196c..0a93065c9 100644
--- a/implementation/src/test/java/io/smallrye/config/KeyMapTest.java
+++ b/implementation/src/test/java/io/smallrye/config/KeyMapTest.java
@@ -3,7 +3,6 @@
 import static java.util.stream.Collectors.toList;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertNull;
-import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import java.util.HashMap;
 import java.util.Map;
@@ -106,26 +105,6 @@ void empty() {
         assertEquals("bar", map.findRootValue(".foo"));
     }
 
-    @Test
-    void unwrap() {
-        KeyMap<String> map = new KeyMap<>();
-        map.findOrAdd("root.foo").putRootValue("bar");
-        map.findOrAdd("root.foo.bar").putRootValue("baz");
-        map.findOrAdd("root.foo.bar.*").putRootValue("baz");
-        map.findOrAdd("root.foo.bar.*.baz").putRootValue("anything");
-
-        Map<String, String> properties = map.toMap();
-        assertTrue(properties.containsKey("root.foo"));
-        assertTrue(properties.containsKey("root.foo.bar"));
-        assertTrue(properties.containsKey("root.foo.bar.*"));
-        assertTrue(properties.containsKey("root.foo.bar.*.baz"));
-
-        assertEquals("bar", properties.get("root.foo"));
-        assertEquals("baz", properties.get("root.foo.bar"));
-        assertEquals("baz", properties.get("root.foo.bar.*"));
-        assertEquals("anything", properties.get("root.foo.bar.*.baz"));
-    }
-
     @Test
     void string() {
         KeyMap<String> map = new KeyMap<>();