diff --git a/extensions/amazon-lambda/common-deployment/src/main/java/io/quarkus/amazon/lambda/deployment/ConfigurationCustomizer.java b/extensions/amazon-lambda/common-deployment/src/main/java/io/quarkus/amazon/lambda/deployment/ConfigurationCustomizer.java
new file mode 100644
index 0000000000000..a47bf965a1ce4
--- /dev/null
+++ b/extensions/amazon-lambda/common-deployment/src/main/java/io/quarkus/amazon/lambda/deployment/ConfigurationCustomizer.java
@@ -0,0 +1,31 @@
+package io.quarkus.amazon.lambda.deployment;
+
+import java.util.OptionalInt;
+
+import io.smallrye.config.ConfigSourceInterceptor;
+import io.smallrye.config.ConfigSourceInterceptorContext;
+import io.smallrye.config.ConfigSourceInterceptorFactory;
+import io.smallrye.config.ConfigValue;
+import io.smallrye.config.SmallRyeConfigBuilder;
+import io.smallrye.config.SmallRyeConfigBuilderCustomizer;
+
+/**
+ * A configuration customizer to change the default packaging to legacy-jar.
+ */
+public final class ConfigurationCustomizer implements SmallRyeConfigBuilderCustomizer {
+    public void configBuilder(final SmallRyeConfigBuilder builder) {
+        builder.withInterceptorFactories(new ConfigSourceInterceptorFactory() {
+            public ConfigSourceInterceptor getInterceptor(final ConfigSourceInterceptorContext context) {
+                return (ic, name) -> switch (name) {
+                    case "quarkus.package.jar.type" ->
+                        ConfigValue.builder().withName(name).withValue("legacy-jar").build();
+                    default -> ic.proceed(name);
+                };
+            }
+
+            public OptionalInt getPriority() {
+                return OptionalInt.of(Integer.MIN_VALUE + 100);
+            }
+        });
+    }
+}
diff --git a/extensions/amazon-lambda/common-deployment/src/main/resources/META-INF/services/io.smallrye.config.SmallRyeConfigBuilderCustomizer b/extensions/amazon-lambda/common-deployment/src/main/resources/META-INF/services/io.smallrye.config.SmallRyeConfigBuilderCustomizer
new file mode 100644
index 0000000000000..8283b5c378f32
--- /dev/null
+++ b/extensions/amazon-lambda/common-deployment/src/main/resources/META-INF/services/io.smallrye.config.SmallRyeConfigBuilderCustomizer
@@ -0,0 +1 @@
+io.quarkus.amazon.lambda.deployment.ConfigurationCustomizer
diff --git a/extensions/funqy/funqy-google-cloud-functions/deployment/src/main/java/io/quarkus/funqy/gcp/functions/deployment/bindings/ConfigurationCustomizer.java b/extensions/funqy/funqy-google-cloud-functions/deployment/src/main/java/io/quarkus/funqy/gcp/functions/deployment/bindings/ConfigurationCustomizer.java
new file mode 100644
index 0000000000000..34547ac69674a
--- /dev/null
+++ b/extensions/funqy/funqy-google-cloud-functions/deployment/src/main/java/io/quarkus/funqy/gcp/functions/deployment/bindings/ConfigurationCustomizer.java
@@ -0,0 +1,31 @@
+package io.quarkus.funqy.gcp.functions.deployment.bindings;
+
+import java.util.OptionalInt;
+
+import io.smallrye.config.ConfigSourceInterceptor;
+import io.smallrye.config.ConfigSourceInterceptorContext;
+import io.smallrye.config.ConfigSourceInterceptorFactory;
+import io.smallrye.config.ConfigValue;
+import io.smallrye.config.SmallRyeConfigBuilder;
+import io.smallrye.config.SmallRyeConfigBuilderCustomizer;
+
+/**
+ * A configuration customizer to change the default packaging to uber-jar.
+ */
+public final class ConfigurationCustomizer implements SmallRyeConfigBuilderCustomizer {
+    public void configBuilder(final SmallRyeConfigBuilder builder) {
+        builder.withInterceptorFactories(new ConfigSourceInterceptorFactory() {
+            public ConfigSourceInterceptor getInterceptor(final ConfigSourceInterceptorContext context) {
+                return (ic, name) -> switch (name) {
+                    case "quarkus.package.jar.type" ->
+                        ConfigValue.builder().withName(name).withValue("uber-jar").build();
+                    default -> ic.proceed(name);
+                };
+            }
+
+            public OptionalInt getPriority() {
+                return OptionalInt.of(Integer.MIN_VALUE + 100);
+            }
+        });
+    }
+}
diff --git a/extensions/funqy/funqy-google-cloud-functions/deployment/src/main/resources/META-INF/services/io.smallrye.config.SmallRyeConfigBuilderCustomizer b/extensions/funqy/funqy-google-cloud-functions/deployment/src/main/resources/META-INF/services/io.smallrye.config.SmallRyeConfigBuilderCustomizer
new file mode 100644
index 0000000000000..90078dc7eaeeb
--- /dev/null
+++ b/extensions/funqy/funqy-google-cloud-functions/deployment/src/main/resources/META-INF/services/io.smallrye.config.SmallRyeConfigBuilderCustomizer
@@ -0,0 +1 @@
+io.quarkus.funqy.gcp.functions.deployment.bindings.ConfigurationCustomizer