diff --git a/configure.ac b/configure.ac
index 0cee6c5..3ea1956 100644
--- a/configure.ac
+++ b/configure.ac
@@ -274,6 +274,8 @@
 	PTRACE_O_TRACEFORK,
 	PTRACE_O_TRACESYSGOOD,
 	PTRACE_O_TRACEVFORK,
+	PTRACE_PEEKUSER,
+	PTRACE_POKEUSER,
 	PTRACE_SETOPTIONS
 ]),,, [#include <sys/ptrace.h>])