diff --git a/pycardium/mpconfigport.h b/pycardium/mpconfigport.h
index d4ff0a0ca31dac0448a3c0564c870398a1a67813..a7d0f7bd2cc34cb61f6a57e3b7e1fcb2d72c1848 100644
--- a/pycardium/mpconfigport.h
+++ b/pycardium/mpconfigport.h
@@ -53,6 +53,7 @@ int mp_hal_csprng_read_int(void);
 #define MICROPY_PY_IO_FILEIO                (1)
 #define MICROPY_PY_UERRNO                   (1)
 #define MICROPY_PY_FRAMEBUF                 (1)
+#define MICROPY_PY_FSTRINGS                 (1)
 #define MICROPY_PY_BLUETOOTH                (1)
 #define MICROPY_PY_BUILTINS_MEMORYVIEW      (1)
 #define MICROPY_PY_BLUETOOTH_ENABLE_CENTRAL_MODE (1)