diff --git a/src/wallet/bdb.h b/src/wallet/bdb.h
--- a/src/wallet/bdb.h
+++ b/src/wallet/bdb.h
@@ -118,6 +118,13 @@
 
     ~BerkeleyDatabase();
 
+    /**
+     * Open the database if it is not already opened.
+     * Dummy function, doesn't do anything right now, but is needed for class
+     * abstraction
+     */
+    void Open(const char *mode);
+
     /**
      * Rewrite the entire database on disk, with the exception of key pszSkip if
      * non-zero
diff --git a/src/wallet/bdb.cpp b/src/wallet/bdb.cpp
--- a/src/wallet/bdb.cpp
+++ b/src/wallet/bdb.cpp
@@ -436,6 +436,11 @@
     }
 }
 
+void BerkeleyDatabase::Open(const char *mode) {
+    throw std::logic_error("BerkeleyDatabase does not implement Open. "
+                           "This function should not be called.");
+}
+
 void BerkeleyBatch::Flush() {
     if (activeTxn) {
         return;