diff --git a/arch/ppc/makecontext.c b/arch/ppc/makecontext.c
index 0633c0f..7214a40 100644
--- a/arch/ppc/makecontext.c
+++ b/arch/ppc/makecontext.c
@@ -11,10 +11,8 @@
  */
 
 #define _GNU_SOURCE
-#include <stddef.h>
 #include <stdarg.h>
 #include <signal.h>
-#include <string.h>
 #include <stdint.h>
 
 
diff --git a/arch/ppc64/makecontext.c b/arch/ppc64/makecontext.c
index 84d390a..2650f56 100644
--- a/arch/ppc64/makecontext.c
+++ b/arch/ppc64/makecontext.c
@@ -11,10 +11,8 @@
  */
 
 #define _GNU_SOURCE
-#include <stddef.h>
 #include <stdarg.h>
 #include <signal.h>
-#include <string.h>
 #include <stdint.h>