diff --git a/lfs/Config b/lfs/Config
index 9ca50c42b..31ea8b79a 100644
--- a/lfs/Config
+++ b/lfs/Config
@@ -64,6 +64,10 @@ ifeq "$(BUILD_ARCH)" "i586"
 	IS_32BIT = 1
 endif
 
+ifeq "$(BUILD_ARCH)" "riscv64"
+	IS_64BIT = 1
+endif
+
 ifeq "$(TOOLCHAIN)" "1"
 	PREFIX = $(TOOLS_DIR)
 else