diff --git a/config/arch.aarch64 b/config/arch.aarch64
index bfe989633a..0d39f35a83 100644
--- a/config/arch.aarch64
+++ b/config/arch.aarch64
@@ -23,6 +23,6 @@
   TARGET_KERNEL_ARCH=arm64
 
 # setup ARCH specific *FLAGS
-  TARGET_CFLAGS="-march=${TARGET_VARIANT}${TARGET_CPU_FLAGS} -mabi=lp64 -Wno-psabi $TARGET_EXTRA_FLAGS"
+  TARGET_CFLAGS="-march=${TARGET_VARIANT}${TARGET_CPU_FLAGS} -mabi=lp64 -Wno-psabi -mtune=$TARGET_CPU $TARGET_EXTRA_FLAGS"
   TARGET_LDFLAGS="-march=${TARGET_VARIANT}${TARGET_CPU_FLAGS} -mtune=$TARGET_CPU"
   GCC_OPTS="--with-abi=lp64 --with-arch=$TARGET_VARIANT"
diff --git a/config/arch.arm b/config/arch.arm
index 8e22263553..e9147e4c07 100644
--- a/config/arch.arm
+++ b/config/arch.arm
@@ -58,7 +58,7 @@
   TARGET_KERNEL_ARCH=${TARGET_KERNEL_ARCH:-arm}
 
 # setup ARCH specific *FLAGS
-  TARGET_CFLAGS="-march=$TARGET_VARIANT -mabi=aapcs-linux -Wno-psabi -Wa,-mno-warn-deprecated $TARGET_EXTRA_FLAGS"
+  TARGET_CFLAGS="-march=$TARGET_VARIANT -mtune=$TARGET_CPU -mabi=aapcs-linux -Wno-psabi -Wa,-mno-warn-deprecated $TARGET_EXTRA_FLAGS"
   [ -n "$TARGET_FPU" ] && TARGET_CFLAGS="$TARGET_CFLAGS $TARGET_FPU_FLAGS"
   TARGET_LDFLAGS="-march=$TARGET_VARIANT -mtune=$TARGET_CPU"
   GCC_OPTS="--with-abi=aapcs-linux --with-arch=$TARGET_SUBARCH --with-float=$TARGET_FLOAT --with-fpu=$TARGET_FPU"