diff --git a/include/GL/glfw3.h b/include/GL/glfw3.h
index 28e38bd1..693e55f3 100644
--- a/include/GL/glfw3.h
+++ b/include/GL/glfw3.h
@@ -390,7 +390,6 @@ extern "C" {
 /* glfwGetWindowParam tokens */
 #define GLFW_ACTIVE               0x00020001
 #define GLFW_ICONIFIED            0x00020002
-#define GLFW_ACCELERATED          0x00020003
 #define GLFW_OPENGL_REVISION      0x00020004
 
 /* The following constants are used for both glfwGetWindowParam
diff --git a/readme.html b/readme.html
index 10fa433b..e5fa8c9d 100644
--- a/readme.html
+++ b/readme.html
@@ -318,6 +318,7 @@ version of GLFW.</p>
   <li>Removed <code>GLFW_OPENED</code> window parameter</li>
   <li>Removed nonsensical key actions for Unicode character input</li>
   <li>Removed <code>GLFWCALL</code> and <code>GLFWAPIENTRY</code> macros for stdcall calling convention</li>
+  <li>Removed <code>GLFW_ACCELERATED</code> window parameter</li>
   <li>Bugfix: The default OpenGL version in the <code>glfwinfo</code> test was set to 1.1</li>
   <li>Bugfix: The OpenGL profile and forward-compatibility window parameters were not saved after context creation</li>
   <li>Bugfix: The FSAA test did not check for the availability of <code>GL_ARB_multisample</code></li>
diff --git a/src/cocoa_window.m b/src/cocoa_window.m
index 9f20398a..e0b146b9 100644
--- a/src/cocoa_window.m
+++ b/src/cocoa_window.m
@@ -1047,11 +1047,6 @@ void _glfwPlatformRefreshWindowParams(void)
 
     // Since GLFW doesn't understand screens, we use virtual screen zero
 
-    [window->NSGL.pixelFormat getValues:&value
-                           forAttribute:NSOpenGLPFAAccelerated
-                       forVirtualScreen:0];
-    window->accelerated = value;
-
     [window->NSGL.pixelFormat getValues:&value
                            forAttribute:NSOpenGLPFAAlphaSize
                        forVirtualScreen:0];
diff --git a/src/internal.h b/src/internal.h
index 700b6c06..f0bc6cb0 100644
--- a/src/internal.h
+++ b/src/internal.h
@@ -211,7 +211,6 @@ struct _GLFWwindow
     int       samples;
 
     // OpenGL extensions and context attributes
-    GLboolean accelerated;     // GL_TRUE if OpenGL context is "accelerated"
     int       glMajor, glMinor, glRevision;
     GLboolean glForward, glDebug;
     int       glProfile;
diff --git a/src/win32_opengl.c b/src/win32_opengl.c
index cc795e53..1bb26bfc 100644
--- a/src/win32_opengl.c
+++ b/src/win32_opengl.c
@@ -300,14 +300,6 @@ static void refreshContextParams(_GLFWwindow* window, int pixelFormat)
 
     if (window->WGL.ARB_pixel_format)
     {
-        if (getPixelFormatAttrib(window, pixelFormat, WGL_ACCELERATION_ARB) !=
-            WGL_NO_ACCELERATION_ARB)
-        {
-            window->accelerated = GL_TRUE;
-        }
-        else
-            window->accelerated = GL_FALSE;
-
         window->redBits =
             getPixelFormatAttrib(window, pixelFormat, WGL_RED_BITS_ARB);
         window->greenBits =
@@ -353,10 +345,6 @@ static void refreshContextParams(_GLFWwindow* window, int pixelFormat)
         DescribePixelFormat(window->WGL.DC, pixelFormat,
                             sizeof(PIXELFORMATDESCRIPTOR), &pfd);
 
-        // Is current OpenGL context accelerated?
-        window->accelerated = (pfd.dwFlags & PFD_GENERIC_ACCELERATED) ||
-                              !(pfd.dwFlags & PFD_GENERIC_FORMAT) ? 1 : 0;
-
         // "Standard" window parameters
         window->redBits        = pfd.cRedBits;
         window->greenBits      = pfd.cGreenBits;
diff --git a/src/window.c b/src/window.c
index f8939e37..119ce7de 100644
--- a/src/window.c
+++ b/src/window.c
@@ -682,8 +682,6 @@ GLFWAPI int glfwGetWindowParam(GLFWwindow handle, int param)
             return window == _glfwLibrary.activeWindow;
         case GLFW_ICONIFIED:
             return window->iconified;
-        case GLFW_ACCELERATED:
-            return window->accelerated;
         case GLFW_RED_BITS:
             return window->redBits;
         case GLFW_GREEN_BITS:
diff --git a/src/x11_opengl.c b/src/x11_opengl.c
index edcd69b6..048b794f 100644
--- a/src/x11_opengl.c
+++ b/src/x11_opengl.c
@@ -233,10 +233,6 @@ static void refreshContextParams(_GLFWwindow* window, GLXFBConfigID fbconfigID)
         abort();
     }
 
-    // There is no clear definition of an "accelerated" context on X11/GLX, and
-    // true sounds better than false, so we hardcode true here
-    window->accelerated = GL_TRUE;
-
     window->redBits = getFBConfigAttrib(window, *fbconfig, GLX_RED_SIZE);
     window->greenBits = getFBConfigAttrib(window, *fbconfig, GLX_GREEN_SIZE);
     window->blueBits = getFBConfigAttrib(window, *fbconfig, GLX_BLUE_SIZE);
diff --git a/tests/defaults.c b/tests/defaults.c
index d7c5a02c..16c62723 100644
--- a/tests/defaults.c
+++ b/tests/defaults.c
@@ -42,7 +42,6 @@ typedef struct
 
 static Param parameters[] =
 {
-    { GLFW_ACCELERATED, "accelerated" },
     { GLFW_RED_BITS, "red bits" },
     { GLFW_GREEN_BITS, "green bits" },
     { GLFW_BLUE_BITS, "blue bits" },