diff --git a/opengl/libagl/egl.cpp b/opengl/libagl/egl.cpp
index 593d0c2d0..ee790c921 100644
--- a/opengl/libagl/egl.cpp
+++ b/opengl/libagl/egl.cpp
@@ -1373,7 +1373,7 @@ static EGLSurface createPbufferSurface(EGLDisplay dpy, EGLConfig config,
 
     int32_t w = 0;
     int32_t h = 0;
-    while (attrib_list[0]) {
+    while (attrib_list[0] != EGL_NONE) {
         if (attrib_list[0] == EGL_WIDTH)  w = attrib_list[1];
         if (attrib_list[0] == EGL_HEIGHT) h = attrib_list[1];
         attrib_list+=2;