diff --git a/src/OpenTK.GLWidget/GLWidget.cs b/src/OpenTK.GLWidget/GLWidget.cs
index 7d9d3a1e..c1d3c5e4 100644
--- a/src/OpenTK.GLWidget/GLWidget.cs
+++ b/src/OpenTK.GLWidget/GLWidget.cs
@@ -49,7 +49,7 @@ namespace OpenTK
         #region Static attrs.
 
         private static int _GraphicsContextCount;
-        private static bool _SharedContextInitialized;
+        private static bool _SharedContextInitialized = false;
 
         #endregion
 
@@ -58,7 +58,7 @@ namespace OpenTK
         private IGraphicsContext _GraphicsContext;
         private IWindowInfo _WindowInfo;
         private GraphicsContextFlags _GraphicsContextFlags;
-        private bool _Initialized;
+        private bool _Initialized = false;
 
         #endregion