diff --git a/gtk/window-decorator/util.c b/gtk/window-decorator/util.c
index db743457366982e90583d827fe0e5b0b8871a641..2fcd78744db094ba29745d8b8f848b3c3ab6ed72 100644
--- a/gtk/window-decorator/util.c
+++ b/gtk/window-decorator/util.c
@@ -75,7 +75,7 @@ get_mwm_prop (Window xwindow)
     gdk_error_trap_push ();
 
     result = XGetWindowProperty (xdisplay, xwindow, mwm_hints_atom,
-				 0L, 20L, FALSE, mwm_hints_atom,
+				 0L, 20L, FALSE, AnyPropertyType,
 				 &actual, &format, &n, &left, &data);
 
     err = gdk_error_trap_pop ();
diff --git a/src/screen.cpp b/src/screen.cpp
index 33d0a9c330e58f9a901426071105d7185bda85ab..bd99aec55bd7077463b2ae492c5b59eb9ca7ad79 100644
--- a/src/screen.cpp
+++ b/src/screen.cpp
@@ -1839,7 +1839,7 @@ cps::XWindowInfo::getMwmHints (Window       id,
 
     result = XGetWindowProperty (dpy, id,
 				 Atoms::mwmHints,
-				 0L, 20L, false, Atoms::mwmHints,
+				 0L, 20L, false, AnyPropertyType,
 				 &actual, &format, &n, &left, &data);
 
     if (result == Success && data)