diff --git a/mach/minixST/cv/cv.c b/mach/minixST/cv/cv.c
index 407e1c313..4ff5e0f4e 100644
--- a/mach/minixST/cv/cv.c
+++ b/mach/minixST/cv/cv.c
@@ -9,6 +9,7 @@
  * Convert ACK a.out file to ST-Minix object format.
  */
 
+#include <stdlib.h>
 #include <stdio.h>
 #include <out.h>
 #include <assert.h>
diff --git a/mach/vax4/cv/cv.c b/mach/vax4/cv/cv.c
index a33babbdf..26769b694 100644
--- a/mach/vax4/cv/cv.c
+++ b/mach/vax4/cv/cv.c
@@ -9,6 +9,7 @@
  * Convert ACK a.out file to VAX Berkeley Unix object format.
  */
 
+#include <stdlib.h>
 #include <stdio.h>
 #include <out.h>
 #include <assert.h>
diff --git a/modules/src/system/stop.c b/modules/src/system/stop.c
index 4e7de966c..d35c98da1 100644
--- a/modules/src/system/stop.c
+++ b/modules/src/system/stop.c
@@ -4,6 +4,7 @@
  */
 /* $Id$ */
 
+#include <stdlib.h>
 #include <system.h>
 
 void