diff --git a/core/deployment/src/main/java/io/quarkus/deployment/configuration/BuildTimeConfigurationReader.java b/core/deployment/src/main/java/io/quarkus/deployment/configuration/BuildTimeConfigurationReader.java
index 774ee4784759f..c0e5181dfa2fc 100644
--- a/core/deployment/src/main/java/io/quarkus/deployment/configuration/BuildTimeConfigurationReader.java
+++ b/core/deployment/src/main/java/io/quarkus/deployment/configuration/BuildTimeConfigurationReader.java
@@ -638,22 +638,22 @@ ReadResult run() {
                     unknownBuildProperties.remove(property);
                     ConfigValue value = config.getConfigValue(property);
                     if (value.getRawValue() != null) {
-                        allBuildTimeValues.put(value.getNameProfiled(), value);
+                        allBuildTimeValues.put(value.getNameProfiled(), value.noProblems().withValue(value.getRawValue()));
                     }
                 }
                 if (buildTimeRunTimeNames.contains(name)) {
                     unknownBuildProperties.remove(property);
                     ConfigValue value = config.getConfigValue(property);
                     if (value.getRawValue() != null) {
-                        allBuildTimeValues.put(value.getNameProfiled(), value);
-                        buildTimeRunTimeValues.put(value.getNameProfiled(), value);
+                        allBuildTimeValues.put(value.getNameProfiled(), value.noProblems().withValue(value.getRawValue()));
+                        buildTimeRunTimeValues.put(value.getNameProfiled(), value.noProblems().withValue(value.getRawValue()));
                     }
                 }
                 if (runTimeNames.contains(name)) {
                     unknownBuildProperties.remove(property);
                     ConfigValue value = runtimeConfig.getConfigValue(property);
                     if (value.getRawValue() != null) {
-                        runTimeValues.put(value.getNameProfiled(), value);
+                        runTimeValues.put(value.getNameProfiled(), value.noProblems().withValue(value.getRawValue()));
                     }
                 }
             }
diff --git a/integration-tests/test-extension/extension/deployment/src/test/java/io/quarkus/extest/ConfigMappingTest.java b/integration-tests/test-extension/extension/deployment/src/test/java/io/quarkus/extest/ConfigMappingTest.java
index 7ceae79dd2046..eb3d4be1e9a2d 100644
--- a/integration-tests/test-extension/extension/deployment/src/test/java/io/quarkus/extest/ConfigMappingTest.java
+++ b/integration-tests/test-extension/extension/deployment/src/test/java/io/quarkus/extest/ConfigMappingTest.java
@@ -12,7 +12,6 @@
 import io.quarkus.extest.runtime.config.TestMappingBuildTimeRunTime;
 import io.quarkus.extest.runtime.config.TestMappingRunTime;
 import io.quarkus.test.QuarkusUnitTest;
-import io.smallrye.config.SmallRyeConfig;
 
 public class ConfigMappingTest {
     @RegisterExtension
@@ -20,9 +19,6 @@ public class ConfigMappingTest {
             .setArchiveProducer(() -> ShrinkWrap.create(JavaArchive.class)
                     .addAsResource("application.properties"));
 
-    @Inject
-    SmallRyeConfig config;
-
     @Inject
     TestMappingBuildTimeRunTime mappingBuildTimeRunTime;
     @Inject
diff --git a/integration-tests/test-extension/extension/runtime/src/main/java/io/quarkus/extest/runtime/config/TestMappingBuildTimeRunTime.java b/integration-tests/test-extension/extension/runtime/src/main/java/io/quarkus/extest/runtime/config/TestMappingBuildTimeRunTime.java
index 781a017516036..02ba6d32dad96 100644
--- a/integration-tests/test-extension/extension/runtime/src/main/java/io/quarkus/extest/runtime/config/TestMappingBuildTimeRunTime.java
+++ b/integration-tests/test-extension/extension/runtime/src/main/java/io/quarkus/extest/runtime/config/TestMappingBuildTimeRunTime.java
@@ -1,8 +1,11 @@
 package io.quarkus.extest.runtime.config;
 
+import java.util.Optional;
+
 import io.quarkus.runtime.annotations.ConfigPhase;
 import io.quarkus.runtime.annotations.ConfigRoot;
 import io.smallrye.config.ConfigMapping;
+import io.smallrye.config.WithDefault;
 
 @ConfigMapping(prefix = "quarkus.mapping.btrt")
 @ConfigRoot(phase = ConfigPhase.BUILD_AND_RUN_TIME_FIXED)
@@ -12,6 +15,12 @@ public interface TestMappingBuildTimeRunTime {
      */
     String value();
 
+    /**
+     * A expression value
+     */
+    @WithDefault("${quarkus.mapping.btrt.expression.value}")
+    Optional<String> expression();
+
     /**
      * A nested Group.
      */