diff --git a/sys/include/vmm/mmap.h b/sys/include/vmm/mmap.h
index 580a0f7..62747e7 100644
--- a/sys/include/vmm/mmap.h
+++ b/sys/include/vmm/mmap.h
@@ -34,7 +34,7 @@
 typedef __vm_size_t vm_size_t;      // vm_size_t
 // @formatter:on
 
-#define EINVAL                  22  // Invalid argument
+// XXX MrOlsen #define EINVAL                  22  // Invalid argument
 #define MAP_ALIGNED(n)          ((n) << MAP_ALIGNMENT_SHIFT)
 #define MAP_ALIGNMENT_SHIFT     24
 #define MAP_ALIGNMENT_MASK      MAP_ALIGNED(0xff)