Index: System.Data.SQLite/SQLiteConnection.cs
==================================================================
--- System.Data.SQLite/SQLiteConnection.cs
+++ System.Data.SQLite/SQLiteConnection.cs
@@ -3721,11 +3721,11 @@
       bool uri = false;
 #endif
       bool fullUri = false;
       string fileName;
 
-      if (Convert.ToInt32(FindKey(opts, "Version", DefaultVersion.ToString()), CultureInfo.InvariantCulture) != DefaultVersion)
+      if (Convert.ToInt32(FindKey(opts, "Version", SQLiteConvert.ToString(DefaultVersion)), CultureInfo.InvariantCulture) != DefaultVersion)
         throw new NotSupportedException(HelperMethods.StringFormat(CultureInfo.CurrentCulture, "Only SQLite Version {0} is supported at this time", DefaultVersion));
 
 #if INTEROP_INCLUDE_ZIPVFS
       bool useZipVfs = false;
       string zipVfsVersion = FindKey(opts, "ZipVfsVersion", DefaultZipVfsVersion);
@@ -3812,16 +3812,16 @@
       }
 
       try
       {
         bool usePooling = SQLiteConvert.ToBoolean(FindKey(opts, "Pooling", GetDefaultPooling().ToString()));
-        int maxPoolSize = Convert.ToInt32(FindKey(opts, "Max Pool Size", DefaultMaxPoolSize.ToString()), CultureInfo.InvariantCulture);
+        int maxPoolSize = Convert.ToInt32(FindKey(opts, "Max Pool Size", SQLiteConvert.ToString(DefaultMaxPoolSize)), CultureInfo.InvariantCulture);
 
-        _defaultTimeout = Convert.ToInt32(FindKey(opts, "Default Timeout", DefaultConnectionTimeout.ToString()), CultureInfo.InvariantCulture);
-        _busyTimeout = Convert.ToInt32(FindKey(opts, "BusyTimeout", DefaultBusyTimeout.ToString()), CultureInfo.InvariantCulture);
-        _prepareRetries = Convert.ToInt32(FindKey(opts, "PrepareRetries", DefaultPrepareRetries.ToString()), CultureInfo.InvariantCulture);
-        _progressOps = Convert.ToInt32(FindKey(opts, "ProgressOps", DefaultProgressOps.ToString()), CultureInfo.InvariantCulture);
+        _defaultTimeout = Convert.ToInt32(FindKey(opts, "Default Timeout", SQLiteConvert.ToString(DefaultConnectionTimeout)), CultureInfo.InvariantCulture);
+        _busyTimeout = Convert.ToInt32(FindKey(opts, "BusyTimeout", SQLiteConvert.ToString(DefaultBusyTimeout)), CultureInfo.InvariantCulture);
+        _prepareRetries = Convert.ToInt32(FindKey(opts, "PrepareRetries", SQLiteConvert.ToString(DefaultPrepareRetries)), CultureInfo.InvariantCulture);
+        _progressOps = Convert.ToInt32(FindKey(opts, "ProgressOps", SQLiteConvert.ToString(DefaultProgressOps)), CultureInfo.InvariantCulture);
 
         enumValue = TryParseEnum(typeof(IsolationLevel), FindKey(opts, "Default IsolationLevel", DefaultIsolationLevel.ToString()), true);
         _defaultIsolation = (enumValue is IsolationLevel) ? (IsolationLevel)enumValue : DefaultIsolationLevel;
         _defaultIsolation = GetEffectiveIsolationLevel(_defaultIsolation);
 
@@ -3918,20 +3918,20 @@
 
                   int intValue;
 
                   if (!fullUri && !isMemory)
                   {
-                      strValue = FindKey(opts, "Page Size", DefaultPageSize.ToString());
+                      strValue = FindKey(opts, "Page Size", SQLiteConvert.ToString(DefaultPageSize));
                       intValue = Convert.ToInt32(strValue, CultureInfo.InvariantCulture);
                       if (intValue != DefaultPageSize)
                       {
                           cmd.CommandText = HelperMethods.StringFormat(CultureInfo.InvariantCulture, "PRAGMA page_size={0}", intValue);
                           cmd.ExecuteNonQuery();
                       }
                   }
 
-                  strValue = FindKey(opts, "Max Page Count", DefaultMaxPageCount.ToString());
+                  strValue = FindKey(opts, "Max Page Count", SQLiteConvert.ToString(DefaultMaxPageCount));
                   intValue = Convert.ToInt32(strValue, CultureInfo.InvariantCulture);
                   if (intValue != DefaultMaxPageCount)
                   {
                       cmd.CommandText = HelperMethods.StringFormat(CultureInfo.InvariantCulture, "PRAGMA max_page_count={0}", intValue);
                       cmd.ExecuteNonQuery();
@@ -3951,11 +3951,11 @@
                   {
                       cmd.CommandText = HelperMethods.StringFormat(CultureInfo.InvariantCulture, "PRAGMA synchronous={0}", strValue);
                       cmd.ExecuteNonQuery();
                   }
 
-                  strValue = FindKey(opts, "Cache Size", DefaultCacheSize.ToString());
+                  strValue = FindKey(opts, "Cache Size", SQLiteConvert.ToString(DefaultCacheSize));
                   intValue = Convert.ToInt32(strValue, CultureInfo.InvariantCulture);
                   if (intValue != DefaultCacheSize)
                   {
                       cmd.CommandText = HelperMethods.StringFormat(CultureInfo.InvariantCulture, "PRAGMA cache_size={0}", intValue);
                       cmd.ExecuteNonQuery();

Index: System.Data.SQLite/SQLiteConvert.cs
==================================================================
--- System.Data.SQLite/SQLiteConvert.cs
+++ System.Data.SQLite/SQLiteConvert.cs
@@ -1169,10 +1169,30 @@
       if (source is bool) return (bool)source;
 
       return ToBoolean(ToStringWithProvider(
           source, CultureInfo.InvariantCulture));
     }
+
+    ///////////////////////////////////////////////////////////////////////////
+
+    /// <summary>
+    /// Converts an integer to a string that can be round-tripped using the
+    /// invariant culture.
+    /// </summary>
+    /// <param name="value">
+    /// The integer value to return the string representation for.
+    /// </param>
+    /// <returns>
+    /// The string representation of the specified integer value, using the
+    /// invariant culture.
+    /// </returns>
+    internal static string ToString(int value)
+    {
+        return value.ToString(CultureInfo.InvariantCulture);
+    }
+
+    ///////////////////////////////////////////////////////////////////////////
 
     /// <summary>
     /// Attempts to convert a <see cref="String" /> into a <see cref="Boolean" />.
     /// </summary>
     /// <param name="source">

Index: Tests/basic.eagle
==================================================================
--- Tests/basic.eagle
+++ Tests/basic.eagle
@@ -4538,10 +4538,38 @@
 } -constraints {eagle command.object monoBug28 command.sql compile.DATA SQLite\
 defineConstant.System.Data.SQLite.INTEROP_SHA1_EXTENSION\
 System.Data.SQLite SQLiteInterop} -result \
 {5578139b470e35a3c231a499d06589215e46e8df\
 a27f5e6f85a3872ed2e4e4018c8fd7dfaff052bc}}
+
+###############################################################################
+
+runTest {test data-1.86 {connection string integer parsing} -setup {
+  object import System.Globalization
+  object import System.Threading
+
+  set culture [object create -alias CultureInfo en-US]
+  $culture NumberFormat.NegativeSign /
+
+  set savedCulture [object invoke Thread.CurrentThread CurrentCulture]
+  object invoke Thread.CurrentThread CurrentCulture $culture
+} -body {
+  setupDb [set fileName data-1.86.db]
+} -cleanup {
+  cleanupDb $fileName
+
+  unset -nocomplain db fileName
+
+  catch {object invoke Thread.CurrentThread CurrentCulture $savedCulture}
+  unset -nocomplain savedCulture culture
+
+  object unimport -importpattern System.Threading
+  object unimport -importpattern System.Globalization
+} -constraints {eagle command.object monoBug28 command.sql compile.DATA SQLite\
+defineConstant.System.Data.SQLite.INTEROP_SHA1_EXTENSION System.Data.SQLite\
+SQLiteInterop} -match regexp -result \
+{^System#Data#SQLite#SQLiteConnection#\d+$}}
 
 ###############################################################################
 
 reportSQLiteResources $test_channel