diff --git a/core/runtime/src/main/java/io/quarkus/runtime/configuration/FastCachedConfigSource.java b/core/runtime/src/main/java/io/quarkus/runtime/configuration/FastCachedConfigSource.java
deleted file mode 100644
index 2a275b205ec4c..0000000000000
--- a/core/runtime/src/main/java/io/quarkus/runtime/configuration/FastCachedConfigSource.java
+++ /dev/null
@@ -1,33 +0,0 @@
-package io.quarkus.runtime.configuration;
-
-import java.util.HashMap;
-
-import org.eclipse.microprofile.config.spi.ConfigSource;
-import org.wildfly.common.Assert;
-
-import io.smallrye.config.PropertiesConfigSource;
-
-/**
- * A configuration source that copies all the keys from another configuration source and then
- * drops any reference to it. Useful for handling configuration sources which have inefficient iteration
- * capabilities.
- */
-public final class FastCachedConfigSource extends PropertiesConfigSource {
-    private final String name;
-
-    /**
-     * Construct a new instance.
-     *
-     * @param delegate the delegate configuration source (must not be {@code null})
-     *
-     * @implNote The {@code delegate} configuration source is not referenced after this call.
-     */
-    public FastCachedConfigSource(final ConfigSource delegate) {
-        super(new HashMap<>(Assert.checkNotNullParam("delegate", delegate.getProperties())), "ignored", delegate.getOrdinal());
-        name = delegate.getName();
-    }
-
-    public String getName() {
-        return name;
-    }
-}