diff --git a/mpy-cross/main.c b/mpy-cross/main.c
index 6e5af2739b..7bf2075962 100644
--- a/mpy-cross/main.c
+++ b/mpy-cross/main.c
@@ -196,6 +196,8 @@ MP_NOINLINE int main_(int argc, char **argv) {
     mp_dynamic_compiler.native_arch = MP_NATIVE_ARCH_X86;
     #elif defined(__x86_64__)
     mp_dynamic_compiler.native_arch = MP_NATIVE_ARCH_X64;
+    #elif defined(__arm__) && !defined(__thumb2__)
+    mp_dynamic_compiler.native_arch = MP_NATIVE_ARCH_ARMV6;
     #else
     mp_dynamic_compiler.native_arch = MP_NATIVE_ARCH_NONE;
     #endif