diff --git a/intern/ghost/intern/GHOST_WindowWin32.cpp b/intern/ghost/intern/GHOST_WindowWin32.cpp
index bf429527199..93f9ccbf1eb 100644
--- a/intern/ghost/intern/GHOST_WindowWin32.cpp
+++ b/intern/ghost/intern/GHOST_WindowWin32.cpp
@@ -712,6 +712,7 @@ GHOST_TSuccess GHOST_WindowWin32::initMultisample(PIXELFORMATDESCRIPTOR pfd)
 		WGL_ACCELERATION_ARB, WGL_FULL_ACCELERATION_ARB,
 		WGL_COLOR_BITS_ARB, pfd.cColorBits,
 		WGL_DEPTH_BITS_ARB, pfd.cDepthBits,
+		WGL_ALPHA_BITS_ART, pfd.cAlphaBits,
 		WGL_STENCIL_BITS_ARB, pfd.cStencilBits,
 		WGL_DOUBLE_BUFFER_ARB, GL_TRUE,
 		WGL_SAMPLE_BUFFERS_ARB, GL_TRUE,
@@ -1321,6 +1322,9 @@ static int WeightPixelFormat(PIXELFORMATDESCRIPTOR& pfd)
 
 	weight += pfd.cColorBits - 8;
 
+	if (pdf.cAlphaBits > 0)
+		weight ++;
+
 	/* want swap copy capability -- it matters a lot */
 	if (pfd.dwFlags & PFD_SWAP_COPY) weight += 16;
 
diff --git a/intern/ghost/intern/GHOST_WindowX11.cpp b/intern/ghost/intern/GHOST_WindowX11.cpp
index 50520b7eda5..8184475b610 100644
--- a/intern/ghost/intern/GHOST_WindowX11.cpp
+++ b/intern/ghost/intern/GHOST_WindowX11.cpp
@@ -213,6 +213,7 @@ GHOST_WindowX11(
 		attributes[i++] = GLX_BLUE_SIZE;  attributes[i++] = 1;
 		attributes[i++] = GLX_GREEN_SIZE; attributes[i++] = 1;
 		attributes[i++] = GLX_DEPTH_SIZE; attributes[i++] = 1;
+		attributes[i++] = GLX_ALPHA_SIZE; attributes[i++] = 1;
 		/* GLX >= 1.4 required for multi-sample */
 		if (samples && (glxVersionMajor >= 1) && (glxVersionMinor >= 4)) {
 			attributes[i++] = GLX_SAMPLE_BUFFERS; attributes[i++] = 1;