diff --git a/framework/Source/iOS/OpenGLContext.swift b/framework/Source/iOS/OpenGLContext.swift
index a740d7ac..39409db2 100755
--- a/framework/Source/iOS/OpenGLContext.swift
+++ b/framework/Source/iOS/OpenGLContext.swift
@@ -9,9 +9,9 @@ public class OpenGLContext: SerialDispatch {
         return FramebufferCache(context:self)
     }()
     var shaderCache:[String:ShaderProgram] = [:]
-    
+
     let context:EAGLContext
-    
+
     lazy var passthroughShader:ShaderProgram = {
         return crashOnShaderCompileFailure("OpenGLContext"){return try self.programForVertexShader(OneInputVertexShader, fragmentShader:PassthroughFragmentShader)}
     }()
@@ -21,8 +21,8 @@ public class OpenGLContext: SerialDispatch {
         let err = CVOpenGLESTextureCacheCreate(kCFAllocatorDefault, nil, self.context, nil, &newTextureCache)
         return newTextureCache!
     }()
-    
-    
+
+
     public let serialDispatchQueue:dispatch_queue_t = dispatch_queue_create("com.sunsetlakesoftware.GPUImage.processingQueue", nil)
     var dispatchKey:Int = 1
     public let dispatchQueueKey:UnsafePointer<Void>
@@ -34,36 +34,36 @@ public class OpenGLContext: SerialDispatch {
         let context = UnsafeMutablePointer<Void>(Unmanaged<dispatch_queue_t>.passUnretained(self.serialDispatchQueue).toOpaque())
         dispatchQueueKey = UnsafePointer<Void>(bitPattern:dispatchKey)
         dispatch_queue_set_specific(serialDispatchQueue, dispatchQueueKey, context, nil)
-        
+
         guard let generatedContext = EAGLContext(API:.OpenGLES2, sharegroup:imageProcessingShareGroup) else {
             fatalError("Unable to create an OpenGL ES 2.0 context. The GPUImage framework requires OpenGL ES 2.0 support to work.")
         }
-        
+
         self.context = generatedContext
         self.makeCurrentContext()
-        
+
         glDisable(GLenum(GL_DEPTH_TEST))
         glEnable(GLenum(GL_TEXTURE_2D))
     }
-    
+
     // MARK: -
     // MARK: Rendering
-    
+
     public func makeCurrentContext() {
         if (EAGLContext.currentContext() != self.context)
         {
             EAGLContext.setCurrentContext(self.context)
         }
     }
-    
+
     func presentBufferForDisplay() {
         self.context.presentRenderbuffer(Int(GL_RENDERBUFFER))
     }
-    
-    
+
+
     // MARK: -
     // MARK: Device capabilities
-    
+
     func supportsTextureCaches() -> Bool {
 #if (arch(i386) || arch(x86_64)) && os(iOS)
         return false // Simulator glitches out on use of texture caches
@@ -71,7 +71,7 @@ public class OpenGLContext: SerialDispatch {
         return true // Every iOS version and device that can run Swift can handle texture caches
 #endif
     }
-    
+
     public var maximumTextureSizeForThisDevice:GLint {get { return _maximumTextureSizeForThisDevice } }
     private lazy var _maximumTextureSizeForThisDevice:GLint = {
         return self.openGLDeviceSettingForOption(GL_MAX_TEXTURE_SIZE)
@@ -87,10 +87,13 @@ public class OpenGLContext: SerialDispatch {
         return self.openGLDeviceSettingForOption(GL_MAX_VARYING_VECTORS)
     }()
 
-    lazy var extensionString:String = {
-        return self.runOperationSynchronously{
+    lazy var extensionString:String = self.createExtensionString()
+
+    private func createExtensionString() -> String {
+        return self.runOperationSynchronously{ () -> String in
             self.makeCurrentContext()
             return String.fromCString(UnsafePointer<CChar>(glGetString(GLenum(GL_EXTENSIONS))))!
         }
-    }()
-}
\ No newline at end of file
+    }
+
+}