diff --git a/quarkus.jdt.ext/com.redhat.microprofile.jdt.quarkus/src/main/java/com/redhat/microprofile/jdt/internal/quarkus/core/properties/QuarkusConfigMappingProvider.java b/quarkus.jdt.ext/com.redhat.microprofile.jdt.quarkus/src/main/java/com/redhat/microprofile/jdt/internal/quarkus/core/properties/QuarkusConfigMappingProvider.java
index cb0a0d7dc..8cd50a168 100644
--- a/quarkus.jdt.ext/com.redhat.microprofile.jdt.quarkus/src/main/java/com/redhat/microprofile/jdt/internal/quarkus/core/properties/QuarkusConfigMappingProvider.java
+++ b/quarkus.jdt.ext/com.redhat.microprofile.jdt.quarkus/src/main/java/com/redhat/microprofile/jdt/internal/quarkus/core/properties/QuarkusConfigMappingProvider.java
@@ -225,7 +225,7 @@ private void populateConfigObject(IType configMappingType, String prefixStr, Str
 					// Other type (App interface, etc)
 					Set<IType> allInterfaces = findInterfaces(returnType, monitor);
 					for (IType configMappingInterface : allInterfaces) {
-						populateConfigObject(configMappingInterface, propertyName, extensionName, typesAlreadyProcessed,
+						populateConfigObject(configMappingInterface, propertyName, extensionName, new HashSet<>(),
 								configMappingAnnotation, collector, monitor);
 					}
 				}