diff --git a/coregrind/m_syscall.c b/coregrind/m_syscall.c
index 2514069..721dafa 100644
--- a/coregrind/m_syscall.c
+++ b/coregrind/m_syscall.c
@@ -29,6 +29,7 @@
 */
 
 #include "pub_core_basics.h"
+#include "pub_core_vki.h"
 #include "pub_core_syscall.h"
 
 /* ---------------------------------------------------------------------