diff --git a/src/blockchain_utilities/blockchain_import.cpp b/src/blockchain_utilities/blockchain_import.cpp
index 14f318768..635a70b10 100644
--- a/src/blockchain_utilities/blockchain_import.cpp
+++ b/src/blockchain_utilities/blockchain_import.cpp
@@ -317,9 +317,9 @@ int import_from_file(cryptonote::core& core, const std::string& import_file_path
       MWARNING("WARNING: chunk_size " << chunk_size << " > BUFFER_SIZE " << BUFFER_SIZE);
       throw std::runtime_error("Aborting: chunk size exceeds buffer size");
     }
-    if (chunk_size > 100000)
+    if (chunk_size > CHUNK_SIZE_WARNING_THRESHOLD)
     {
-      MINFO("NOTE: chunk_size " << chunk_size << " > 100000");
+      MINFO("NOTE: chunk_size " << chunk_size << " > " << CHUNK_SIZE_WARNING_THRESHOLD);
     }
     else if (chunk_size == 0) {
       MFATAL("ERROR: chunk_size == 0");
@@ -327,9 +327,19 @@ int import_from_file(cryptonote::core& core, const std::string& import_file_path
     }
     import_file.read(buffer_block, chunk_size);
     if (! import_file) {
-      MFATAL("ERROR: unexpected end of file: bytes read before error: "
-          << import_file.gcount() << " of chunk_size " << chunk_size);
-      return 2;
+      if (import_file.eof())
+      {
+        std::cout << refresh_string;
+        MINFO("End of file reached - file was truncated");
+        quit = 1;
+        break;
+      }
+      else
+      {
+        MFATAL("ERROR: unexpected end of file: bytes read before error: "
+            << import_file.gcount() << " of chunk_size " << chunk_size);
+        return 2;
+      }
     }
     bytes_read += chunk_size;
     MDEBUG("Total bytes read: " << bytes_read);
@@ -686,18 +696,12 @@ int main(int argc, char* argv[])
   MINFO("bootstrap file path: " << import_file_path);
   MINFO("database path:       " << m_config_folder);
 
+  cryptonote::cryptonote_protocol_stub pr; //TODO: stub only for this kind of test, make real validation of relayed objects
+  cryptonote::core core(&pr);
+
   try
   {
 
-  // fake_core needed for verification to work when enabled.
-  //
-  // NOTE: don't need fake_core method of doing things when we're going to call
-  // BlockchainDB add_block() directly and have available the 3 block
-  // properties to do so. Both ways work, but fake core isn't necessary in that
-  // circumstance.
-
-  cryptonote::cryptonote_protocol_stub pr; //TODO: stub only for this kind of test, make real validation of relayed objects
-  cryptonote::core core(&pr);
   core.disable_dns_checkpoints(true);
   if (!core.init(vm, NULL))
   {
@@ -725,23 +729,19 @@ int main(int argc, char* argv[])
 
   import_from_file(core, import_file_path, block_stop);
 
+  // ensure db closed
+  //   - transactions properly checked and handled
+  //   - disk sync if needed
+  //
+  core.deinit();
   }
   catch (const DB_ERROR& e)
   {
     std::cout << std::string("Error loading blockchain db: ") + e.what() + " -- shutting down now" << ENDL;
+    core.deinit();
     return 1;
   }
 
-  // destructors called at exit:
-  //
-  // ensure db closed
-  //   - transactions properly checked and handled
-  //   - disk sync if needed
-  //
-  // fake_core object's destructor is called when it goes out of scope. For an
-  // LMDB fake_core, it calls Blockchain::deinit() on its object, which in turn
-  // calls delete on its BlockchainDB derived class' object, which closes its
-  // files.
   return 0;
 
   CATCH_ENTRY("Import error", 1);
diff --git a/src/blockchain_utilities/blockchain_utilities.h b/src/blockchain_utilities/blockchain_utilities.h
index af934bf29..6fb5e1131 100644
--- a/src/blockchain_utilities/blockchain_utilities.h
+++ b/src/blockchain_utilities/blockchain_utilities.h
@@ -34,6 +34,7 @@
 // bounds checking is done before writing to buffer, but buffer size
 // should be a sensible maximum
 #define BUFFER_SIZE 1000000
+#define CHUNK_SIZE_WARNING_THRESHOLD 500000
 #define NUM_BLOCKS_PER_CHUNK 1
 #define BLOCKCHAIN_RAW "blockchain.raw"
 
diff --git a/src/blockchain_utilities/bootstrap_file.cpp b/src/blockchain_utilities/bootstrap_file.cpp
index d5bb37d93..2b1a5d6c7 100644
--- a/src/blockchain_utilities/bootstrap_file.cpp
+++ b/src/blockchain_utilities/bootstrap_file.cpp
@@ -436,10 +436,10 @@ uint64_t BootstrapFile::count_blocks(const std::string& import_file_path)
           << "  height: " << h-1);
       throw std::runtime_error("Aborting: chunk size exceeds buffer size");
     }
-    if (chunk_size > 100000)
+    if (chunk_size > CHUNK_SIZE_WARNING_THRESHOLD)
     {
       std::cout << refresh_string;
-      MDEBUG("NOTE: chunk_size " << chunk_size << " > 100000" << "  height: "
+      MDEBUG("NOTE: chunk_size " << chunk_size << " > " << CHUNK_SIZE_WARNING_THRESHOLD << " << height: "
           << h-1);
     }
     else if (chunk_size <= 0) {