diff --git a/Modules/Core/Metadata/include/otbMetadataSupplierInterface.h b/Modules/Core/Metadata/include/otbMetadataSupplierInterface.h
index 61dc061b4c0b352702d4d3917c5af5d1f44d4f6f..b3b695da47adc4ea0459c5d36ff419b00a8976e6 100644
--- a/Modules/Core/Metadata/include/otbMetadataSupplierInterface.h
+++ b/Modules/Core/Metadata/include/otbMetadataSupplierInterface.h
@@ -67,7 +67,7 @@ class OTBMetadata_EXPORT MetadataSupplierInterface
 {
 public:
 
-  virtual std::string GetResourceFile() = 0;
+  virtual std::string GetResourceFile() const = 0;
 
   // Maybe not needed
 //  virtual std::vector<std::string> GetResourceFiles() = 0;