diff --git a/ports/nrf/mpconfigport.h b/ports/nrf/mpconfigport.h
index 427b5ef1c..ff79fccfa 100644
--- a/ports/nrf/mpconfigport.h
+++ b/ports/nrf/mpconfigport.h
@@ -133,7 +133,7 @@
 #define MICROPY_PY_URANDOM_EXTRA_FUNCS (0)
 #define MICROPY_PY_UCTYPES          (0)
 #define MICROPY_PY_UZLIB            (0)
-#define MICROPY_PY_UJSON            (0)
+#define MICROPY_PY_UJSON            (1)
 #define MICROPY_PY_URE              (0)
 #define MICROPY_PY_UHEAPQ           (0)
 #define MICROPY_PY_UHASHLIB         (0)