diff --git a/src/dpsup.c b/src/dpsup.c
index 417bfde..27272bd 100644
--- a/src/dpsup.c
+++ b/src/dpsup.c
@@ -40,6 +40,7 @@ static int decosfcclossage;
 #if KLH10_DEV_DP		/* Moby conditional for entire file */
 
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>		/* For strerror() if present */
 
 #include "dpsup.h"
diff --git a/src/dvuba.c b/src/dvuba.c
index 338184d..5f50b76 100644
--- a/src/dvuba.c
+++ b/src/dvuba.c
@@ -48,6 +48,7 @@ static int decosfcclossage;
 #if KLH10_CPU_KS	/* Moby conditional for entire file */
 
 #include <stdio.h>	/* For stderr if buggy */
+#include <string.h>
 
 #include "kn10def.h"
 #include "kn10ops.h"
diff --git a/src/enaddr.c b/src/enaddr.c
index 330682c..9258a0f 100644
--- a/src/enaddr.c
+++ b/src/enaddr.c
@@ -52,6 +52,7 @@
 
 #include <stdio.h>
 #include <errno.h>
+#include <stdlib.h>
 #include <stdarg.h>
 #include <string.h>
 
diff --git a/src/osdsup.c b/src/osdsup.c
index 4189ca6..737ee2b 100644
--- a/src/osdsup.c
+++ b/src/osdsup.c
@@ -44,6 +44,7 @@
  */
 
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>	/* For strrchr */
 
 #include "klh10.h"