diff --git a/riscv/cfg.cc b/riscv/cfg.cc
index 67dfdb4c..8763240b 100644
--- a/riscv/cfg.cc
+++ b/riscv/cfg.cc
@@ -1,5 +1,6 @@
 // See LICENSE for license details.
 
+#include "config.h"
 #include "cfg.h"
 #include "mmu.h"
 #include "decode.h"