diff --git a/build.config.aarch64 b/build.config.aarch64
index df8f76ab272c..e0a51433cd16 100644
--- a/build.config.aarch64
+++ b/build.config.aarch64
@@ -1,6 +1,4 @@
 ARCH=arm64
-LLVM_IAS=1
-CROSS_COMPILE=aarch64-linux-gnu-
 
 FILES="
 arch/arm64/boot/Image.gz
diff --git a/build.config.arm b/build.config.arm
index dce13076dfcb..cc802a1948bb 100644
--- a/build.config.arm
+++ b/build.config.arm
@@ -1,6 +1,4 @@
 ARCH=arm
-LLVM_IAS=1
-CROSS_COMPILE=arm-linux-gnueabi-
 
 FILES="
 arch/arm/boot/Image.gz
diff --git a/build.config.x86_64 b/build.config.x86_64
index cfbee0c5f881..c51c522c8445 100644
--- a/build.config.x86_64
+++ b/build.config.x86_64
@@ -1,6 +1,4 @@
 ARCH=x86_64
-LLVM_IAS=1
-CROSS_COMPILE=x86_64-linux-gnu-
 
 FILES="
 arch/x86/boot/bzImage