1 files changed, 1 insertions, 0 deletions
diff --git a/src/IO.c b/src/IO.c
index 901ef76..d4a0f55 100644
--- a/src/IO.c
+++ b/src/IO.c
@@ -10,6 +10,7 @@
 
 #include "cctk.h"
 #include "cctk_Parameters.h"
+#include <stdlib.h>
 #include <fcntl.h>
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>