diff --git a/config.h b/config.h
index 39e4a5c..b44f715 100644
--- a/config.h
+++ b/config.h
@@ -52,6 +52,8 @@
 #include "ruby/config-mipsel.h"
 #elif defined(__mips)
 #include "ruby/config-mips.h"
+#elif defined(__riscv64)
+#include "ruby/config-riscv64.h"
 #else
 #error "The ruby-devel package is not usable with the architecture."
 #endif