diff --git a/glx/rensize.c b/glx/rensize.c
index 821c6b3fb..f48182210 100644
--- a/glx/rensize.c
+++ b/glx/rensize.c
@@ -347,7 +347,7 @@ __glXTypeSize(GLenum enm)
     case GL_INT:
         return sizeof(GLint);
     case GL_UNSIGNED_INT:
-        return sizeof(GLint);
+        return sizeof(GLuint);
     case GL_FLOAT:
         return sizeof(GLfloat);
     case GL_DOUBLE: