Index: System.Data.SQLite/UnsafeNativeMethods.cs
==================================================================
--- System.Data.SQLite/UnsafeNativeMethods.cs
+++ System.Data.SQLite/UnsafeNativeMethods.cs
@@ -12,15 +12,13 @@
 
 #if !NET_COMPACT_20 && (TRACE_DETECTION || TRACE_SHARED || TRACE_PRELOAD || TRACE_HANDLE)
   using System.Diagnostics;
 #endif
 
-#if PRELOAD_NATIVE_LIBRARY
   using System.Collections.Generic;
   using System.IO;
   using System.Reflection;
-#endif
 
 #if !PLATFORM_COMPACTFRAMEWORK && !DEBUG
   using System.Security;
 #endif
 
@@ -272,21 +270,24 @@
 
           /////////////////////////////////////////////////////////////////////
 
           #region Debug Build Only
 #if DEBUG
-          //
-          // NOTE: Update statistics for this setting value.
-          //
-          if (settingReadCounts != null)
-          {
-              int count;
-
-              if (settingReadCounts.TryGetValue(name, out count))
-                  settingReadCounts[name] = count + 1;
-              else
-                  settingReadCounts.Add(name, 1);
+          lock (staticSyncRoot)
+          {
+              //
+              // NOTE: Update statistics for this setting value.
+              //
+              if (settingReadCounts != null)
+              {
+                  int count;
+
+                  if (settingReadCounts.TryGetValue(name, out count))
+                      settingReadCounts[name] = count + 1;
+                  else
+                      settingReadCounts.Add(name, 1);
+              }
           }
 #endif
           #endregion
 
           /////////////////////////////////////////////////////////////////////