diff --git a/implementation/src/main/java/io/smallrye/config/SmallRyeConfigBuilder.java b/implementation/src/main/java/io/smallrye/config/SmallRyeConfigBuilder.java
index e4f30ad65..f06d52a5c 100644
--- a/implementation/src/main/java/io/smallrye/config/SmallRyeConfigBuilder.java
+++ b/implementation/src/main/java/io/smallrye/config/SmallRyeConfigBuilder.java
@@ -34,6 +34,7 @@
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Iterator;
+import java.util.LinkedHashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.OptionalInt;
@@ -213,10 +214,10 @@ public OptionalInt getPriority() {
             }
 
             private List<String> getProfile(final ConfigSourceInterceptorContext context) {
-                List<String> profiles = new ArrayList<>();
+                Set<String> profiles = new LinkedHashSet<>();
                 profiles.addAll(getProfiles(context, SMALLRYE_CONFIG_PROFILE_PARENT));
                 profiles.addAll(getProfiles(context, SMALLRYE_CONFIG_PROFILE));
-                return profiles;
+                return new ArrayList<>(profiles);
             }
 
             private List<String> getProfiles(final ConfigSourceInterceptorContext context, final String propertyName) {
diff --git a/implementation/src/test/java/io/smallrye/config/ProfileConfigSourceInterceptorTest.java b/implementation/src/test/java/io/smallrye/config/ProfileConfigSourceInterceptorTest.java
index ee2a84b3e..6adf136f4 100644
--- a/implementation/src/test/java/io/smallrye/config/ProfileConfigSourceInterceptorTest.java
+++ b/implementation/src/test/java/io/smallrye/config/ProfileConfigSourceInterceptorTest.java
@@ -10,6 +10,7 @@
 import static org.junit.jupiter.api.Assertions.assertArrayEquals;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertIterableEquals;
 import static org.junit.jupiter.api.Assertions.assertNull;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.junit.jupiter.api.Assertions.assertTrue;
@@ -502,6 +503,18 @@ void multipleProfileProperty() {
         assertEquals("double", common.getRawValue("triple.prop"));
     }
 
+    @Test
+    void duplicatedProfilesActive() {
+        SmallRyeConfig config = new SmallRyeConfigBuilder()
+                .addDefaultInterceptors()
+                .withSources(config(SMALLRYE_CONFIG_PROFILE, "prod,kubernetes"))
+                .withSources(config(SMALLRYE_CONFIG_PROFILE_PARENT, "cluster"))
+                .withSources(config("%kubernetes." + SMALLRYE_CONFIG_PROFILE_PARENT, "cluster"))
+                .build();
+
+        assertIterableEquals(List.of("kubernetes", "prod", "cluster"), config.getProfiles());
+    }
+
     private static SmallRyeConfig buildConfig(String... keyValues) {
         return new SmallRyeConfigBuilder()
                 .addDefaultInterceptors()