diff --git a/ports/renesas-ra/timer.c b/ports/renesas-ra/timer.c
index 286bc4d0fb..5038936a83 100644
--- a/ports/renesas-ra/timer.c
+++ b/ports/renesas-ra/timer.c
@@ -339,7 +339,7 @@ static mp_obj_t pyb_timer_freq(size_t n_args, const mp_obj_t *args) {
         uint32_t freq;
         if (0) {
         #if MICROPY_PY_BUILTINS_FLOAT
-        } else if (mp_obj_is_type(args[1], &mp_type_float)) {
+        } else if (mp_obj_is_float(args[1])) {
             freq = (int)mp_obj_get_float(args[1]);
         #endif
         } else {
diff --git a/ports/stm32/timer.c b/ports/stm32/timer.c
index a2f48139ee..d70878267e 100644
--- a/ports/stm32/timer.c
+++ b/ports/stm32/timer.c
@@ -450,7 +450,7 @@ static uint32_t compute_prescaler_period_from_freq(pyb_timer_obj_t *self, mp_obj
     uint32_t period;
     if (0) {
     #if MICROPY_PY_BUILTINS_FLOAT
-    } else if (mp_obj_is_type(freq_in, &mp_type_float)) {
+    } else if (mp_obj_is_float(freq_in)) {
         float freq = mp_obj_get_float_to_f(freq_in);
         if (freq <= 0) {
             goto bad_freq;
@@ -545,7 +545,7 @@ static uint32_t compute_pwm_value_from_percent(uint32_t period, mp_obj_t percent
     uint32_t cmp;
     if (0) {
     #if MICROPY_PY_BUILTINS_FLOAT
-    } else if (mp_obj_is_type(percent_in, &mp_type_float)) {
+    } else if (mp_obj_is_float(percent_in)) {
         mp_float_t percent = mp_obj_get_float(percent_in);
         if (percent <= 0.0) {
             cmp = 0;