diff --git a/cpukit/posix/src/mmap.c b/cpukit/posix/src/mmap.c
index 3ebb2f4f85..90c6d0af7a 100644
--- a/cpukit/posix/src/mmap.c
+++ b/cpukit/posix/src/mmap.c
@@ -26,5 +26,5 @@ void *mmap(
   off_t   off
 )
 {
-  return NULL;
+  return MAP_FAILED;
 }