diff --git a/libraries/StorageManager/StorageManager.cpp b/libraries/StorageManager/StorageManager.cpp
index 79065cb99c..59f42cbe58 100644
--- a/libraries/StorageManager/StorageManager.cpp
+++ b/libraries/StorageManager/StorageManager.cpp
@@ -292,7 +292,7 @@ void StorageAccess::write_uint32(uint16_t loc, uint32_t value) const
 /*
   copy one area to another
  */
-bool StorageAccess::copy_area(const StorageAccess &source)
+bool StorageAccess::copy_area(const StorageAccess &source) const
 {
     // we deliberately allow for copies from smaller areas. This
     // allows for a partial backup region for parameters
diff --git a/libraries/StorageManager/StorageManager.h b/libraries/StorageManager/StorageManager.h
index f427f324b7..bf4c20c08f 100644
--- a/libraries/StorageManager/StorageManager.h
+++ b/libraries/StorageManager/StorageManager.h
@@ -102,7 +102,7 @@ public:
     void write_uint32(uint16_t loc, uint32_t value) const;
 
     // copy from one storage area to another
-    bool copy_area(const StorageAccess &source);
+    bool copy_area(const StorageAccess &source) const;
 
 private:
     const StorageManager::StorageType type;