1 files changed, 2 insertions, 2 deletions
diff --git a/rts/Arena.c b/rts/Arena.c
index fcdc6cce14..7fc49f44d7 100644
--- a/rts/Arena.c
+++ b/rts/Arena.c
@@ -18,12 +18,12 @@
    which most allocations are small.
    -------------------------------------------------------------------------- */
 
+#include "PosixSource.h"
 #include "Rts.h"
+
 #include "RtsUtils.h"
 #include "Arena.h"
 
-#include <stdlib.h>
-
 // Each arena struct is allocated using malloc().
 struct _Arena {
     bdescr *current;