diff --git a/src/rp2_common/hardware_pio/include/hardware/pio.h b/src/rp2_common/hardware_pio/include/hardware/pio.h
index 7eda36da6..86aababbc 100644
--- a/src/rp2_common/hardware_pio/include/hardware/pio.h
+++ b/src/rp2_common/hardware_pio/include/hardware/pio.h
@@ -647,9 +647,10 @@ static inline void sm_config_set_mov_status(pio_sm_config *c, enum pio_mov_statu
  * \return the default state machine configuration which can then be modified.
  */
 static inline pio_sm_config pio_get_default_sm_config(void) {
-    pio_sm_config c = {0};
-#if PICO_PIO_USE_GPIO_BASE
-    c.pinhi = -1;
+ #if PICO_PIO_USE_GPIO_BASE
+    pio_sm_config c = {0, 0, 0, 0, -1};
+#else
+    pio_sm_config c = {0, 0, 0, 0};
 #endif
     sm_config_set_clkdiv_int_frac(&c, 1, 0);
     sm_config_set_wrap(&c, 0, 31);