diff --git a/backends/ppc_initreg.c b/backends/ppc_initreg.c
index 0e0d359..810e14a 100644
--- a/backends/ppc_initreg.c
+++ b/backends/ppc_initreg.c
@@ -33,6 +33,7 @@
 #include <stdlib.h>
 #if defined(__powerpc__) && defined(__linux__)
 # include <sys/ptrace.h>
+# include <linux/ptrace.h>
 # include <sys/user.h>
 #endif