http://mail.gnome.org/archives/wm-spec-list/2003-March/msg00067.html
--- a/main.c
+++ b/main.c
@@ -1441,6 +1451,8 @@
 
     /* null terminate the result to make string handling easier */
     tmp_size = (ret_format / 8) * ret_nitems;
+    /* Correct 64 Architecture implementation of 32 bit data */
+    if(ret_format==32) tmp_size *= sizeof(long)/4;
     ret = g_malloc(tmp_size + 1);
     memcpy(ret, ret_prop, tmp_size);
     ret[tmp_size] = '\0';