diff --git a/config/config-mp/src/main/java/io/helidon/config/mp/MpEnvironmentVariablesSource.java b/config/config-mp/src/main/java/io/helidon/config/mp/MpEnvironmentVariablesSource.java
index 9b1a62bf5b8..ae383148091 100644
--- a/config/config-mp/src/main/java/io/helidon/config/mp/MpEnvironmentVariablesSource.java
+++ b/config/config-mp/src/main/java/io/helidon/config/mp/MpEnvironmentVariablesSource.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2020, 2023 Oracle and/or its affiliates.
+ * Copyright (c) 2020, 2024 Oracle and/or its affiliates.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -26,8 +26,9 @@
 import jakarta.annotation.Priority;
 import org.eclipse.microprofile.config.spi.ConfigSource;
 
-@Priority(300)
+@Priority(MpEnvironmentVariablesSource.MY_DEFAULT_ORDINAL)
 class MpEnvironmentVariablesSource implements ConfigSource {
+    static final int MY_DEFAULT_ORDINAL = 300;
     private static final Pattern DISALLOWED_CHARS = Pattern.compile("[^a-zA-Z0-9_]");
     private static final String UNDERSCORE = "_";
 
@@ -72,6 +73,16 @@ public String getValue(String propertyName) {
         }).value;
     }
 
+    @Override
+    public int getOrdinal() {
+        String configOrdinal = getValue(CONFIG_ORDINAL);
+        if (configOrdinal == null) {
+            return MY_DEFAULT_ORDINAL;
+        } else {
+            return ConfigSource.super.getOrdinal();
+        }
+    }
+
     @Override
     public String getName() {
         return "Environment Variables";
diff --git a/config/config-mp/src/main/java/io/helidon/config/mp/MpSystemPropertiesSource.java b/config/config-mp/src/main/java/io/helidon/config/mp/MpSystemPropertiesSource.java
index f9cf1d96489..881e142fd08 100644
--- a/config/config-mp/src/main/java/io/helidon/config/mp/MpSystemPropertiesSource.java
+++ b/config/config-mp/src/main/java/io/helidon/config/mp/MpSystemPropertiesSource.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2020, 2021 Oracle and/or its affiliates.
+ * Copyright (c) 2020, 2024 Oracle and/or its affiliates.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -25,8 +25,9 @@
 import jakarta.annotation.Priority;
 import org.eclipse.microprofile.config.spi.ConfigSource;
 
-@Priority(400)
+@Priority(MpSystemPropertiesSource.MY_DEFAULT_ORDINAL)
 class MpSystemPropertiesSource implements ConfigSource {
+    static final int MY_DEFAULT_ORDINAL = 400;
     private final Properties props;
 
     MpSystemPropertiesSource() {
@@ -57,6 +58,16 @@ public String getName() {
         return "System Properties";
     }
 
+    @Override
+    public int getOrdinal() {
+        String configOrdinal = getValue(CONFIG_ORDINAL);
+        if (configOrdinal == null) {
+            return MY_DEFAULT_ORDINAL;
+        } else {
+            return ConfigSource.super.getOrdinal();
+        }
+    }
+
     @Override
     public String toString() {
         return getName() + " (" + getOrdinal() + ")";
diff --git a/config/config-mp/src/test/java/io/helidon/config/mp/MpConfigSourcesTest.java b/config/config-mp/src/test/java/io/helidon/config/mp/MpConfigSourcesTest.java
index c19925f9181..90568997c39 100644
--- a/config/config-mp/src/test/java/io/helidon/config/mp/MpConfigSourcesTest.java
+++ b/config/config-mp/src/test/java/io/helidon/config/mp/MpConfigSourcesTest.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2020, 2022 Oracle and/or its affiliates.
+ * Copyright (c) 2020, 2024 Oracle and/or its affiliates.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -107,6 +107,18 @@ void testMpConfigSourcesNullConfig() {
         assertThat(npe.getMessage(), is("Config cannot be null"));
     }
 
+    @Test
+    void testSystemPropertiesConfigSourceDefaultOrdinal() {
+        org.eclipse.microprofile.config.spi.ConfigSource configSource = MpConfigSources.systemProperties();
+        assertThat(configSource.getOrdinal(), is(400));
+    }
+
+    @Test
+    void testEnvironmentVariablesConfigSourceDefaultOrdinal() {
+        org.eclipse.microprofile.config.spi.ConfigSource configSource = MpConfigSources.environmentVariables();
+        assertThat(configSource.getOrdinal(), is(300));
+    }
+
     private static final class NodeImpl implements ConfigSource, NodeConfigSource {
         private static final String DESCRIPTION = "node-unit-test";
         private static final String KEY = "key";