diff --git a/build.config.arm b/build.config.arm
index 77f8dc815e16..d944676a87e0 100644
--- a/build.config.arm
+++ b/build.config.arm
@@ -1,5 +1,6 @@
 ARCH=arm
 
+LLVM_IAS=1
 CROSS_COMPILE=arm-linux-gnueabi-
 LINUX_GCC_CROSS_COMPILE_PREBUILTS_BIN=prebuilts/gas/linux-x86