diff --git a/libgfortran/intrinsics/random.c b/libgfortran/intrinsics/random.c
--- a/libgfortran/intrinsics/random.c
+++ b/libgfortran/intrinsics/random.c
@@ -27,6 +27,7 @@ see the files COPYING3 and COPYING.RUNTI
 #include "libgfortran.h"
 #include <gthr.h>
 #include <string.h>
+#include <stdlib.h>
 
 /* For getosrandom.  */
 #ifdef HAVE_SYS_TYPES_H