diff --git a/micropython/modules/breakout_bme69x/breakout_bme69x.cpp b/micropython/modules/breakout_bme69x/breakout_bme69x.cpp
index a20dbe9a..5da4a4b7 100644
--- a/micropython/modules/breakout_bme69x/breakout_bme69x.cpp
+++ b/micropython/modules/breakout_bme69x/breakout_bme69x.cpp
@@ -39,7 +39,7 @@ mp_obj_t BreakoutBME69X_make_new(const mp_obj_type_t *type, size_t n_args, size_
     self->breakout = m_new_class(BME69X, (pimoroni::I2C *)(self->i2c->i2c), args[ARG_address].u_int, args[ARG_int].u_int);
 
     if(!self->breakout->init()) {
-        mp_raise_msg(&mp_type_RuntimeError, "BreakoutBME69X: breakout not found when initialising");
+        mp_raise_msg(&mp_type_RuntimeError, MP_ERROR_TEXT("BreakoutBME69X: breakout not found when initialising"));
     }
 
     return MP_OBJ_FROM_PTR(self);
@@ -71,7 +71,7 @@ mp_obj_t BreakoutBME69X_read(size_t n_args, const mp_obj_t *pos_args, mp_map_t *
         return mp_obj_new_tuple(7, tuple);
     }
     else {
-        mp_raise_msg(&mp_type_RuntimeError, "BreakoutBME69X: failed read_forced");
+        mp_raise_msg(&mp_type_RuntimeError, MP_ERROR_TEXT("BreakoutBME69X: failed read_forced"));
         return mp_const_none;
     }
 }