diff --git a/arch/arm/src/imxrt/imxrt_flexio.h b/arch/arm/src/imxrt/imxrt_flexio.h
index 6c335585351..fc994a111f8 100644
--- a/arch/arm/src/imxrt/imxrt_flexio.h
+++ b/arch/arm/src/imxrt/imxrt_flexio.h
@@ -34,8 +34,6 @@
 #include "imxrt_config.h"
 #include "hardware/imxrt_flexio.h"
 
-#ifdef CONFIG_IMXRT_FLEXIO
-
 /****************************************************************************
  * Pre-processor Definitions
  ****************************************************************************/
@@ -240,6 +238,8 @@ enum flexio_shifter_buffer_type_e
   FLEXIO_SHIFTER_BUFFER_NIBBLE_SWAPPED      = 0x6u, /* Shifter Buffer N Nibble Swapped Register. */
 };
 
+#ifdef CONFIG_IMXRT_FLEXIO
+
 struct flexio_timer_config_s
 {
   uint32_t trigger_select;