diff --git a/src/wgl_context.c b/src/wgl_context.c
index c283e99f..d98ba063 100644
--- a/src/wgl_context.c
+++ b/src/wgl_context.c
@@ -328,7 +328,7 @@ int _glfwCreateContext(_GLFWwindow* window,
                        const _GLFWfbconfig* fbconfig)
 {
     int attribs[40];
-    int pixelFormat;
+    int pixelFormat = 0;
     PIXELFORMATDESCRIPTOR pfd;
     HGLRC share = NULL;