diff --git a/src/proxy_datastore.cpp b/src/proxy_datastore.cpp
index 67a3cb3..32b148a 100644
--- a/src/proxy_datastore.cpp
+++ b/src/proxy_datastore.cpp
@@ -94,7 +94,7 @@
     return m_datastore->schema();
 }
 
-std::optional<std::string> ProxyDatastore::inputDatastorePath()
+std::optional<std::string> ProxyDatastore::inputDatastorePath() const
 {
     return m_inputPath;
 }
diff --git a/src/proxy_datastore.hpp b/src/proxy_datastore.hpp
index 20a877d..befde09 100644
--- a/src/proxy_datastore.hpp
+++ b/src/proxy_datastore.hpp
@@ -35,7 +35,7 @@
     [[nodiscard]] DatastoreAccess::Tree execute();
     void cancel();
 
-    std::optional<std::string> inputDatastorePath();
+    std::optional<std::string> inputDatastorePath() const;
 
     [[nodiscard]] std::shared_ptr<Schema> schema() const;