diff --git a/x1/Makefile b/x1/Makefile
index 1faf865..9a4bf0a 100644
--- a/x1/Makefile
+++ b/x1/Makefile
@@ -1,4 +1,4 @@
-CROSS_COMPILE:=arm-linux-gnueabi-
+CROSS_COMPILE:=arm-linux-gnueabihf-
 AS:=$(CROSS_COMPILE)as
 
 .PHONY:
diff --git a/x1/README.md b/x1/README.md
index 5dbc408..11d1df2 100644
--- a/x1/README.md
+++ b/x1/README.md
@@ -6,6 +6,7 @@
 
 #### Build
 ```sh
+apt install gcc-arm-linux-gnueabihf
 pip3 install pyelftools
 make all
 ```