diff --git a/ports/zephyr/mpconfigport.h b/ports/zephyr/mpconfigport.h
index 6bfd9ff884..966f7f7e94 100644
--- a/ports/zephyr/mpconfigport.h
+++ b/ports/zephyr/mpconfigport.h
@@ -110,7 +110,7 @@
 #define MICROPY_HW_MCU_NAME "unknown-cpu"
 #endif
 
-#define MICROPY_MODULE_FROZEN_STR   (1)
+#define MICROPY_MODULE_FROZEN_STR   (0)
 
 typedef int mp_int_t; // must be pointer size
 typedef unsigned mp_uint_t; // must be pointer size