diff --git a/examples/hwapi/hwconfig_dragonboard410c.py b/examples/hwapi/hwconfig_dragonboard410c.py
index 2db21165d2..eec3582039 100644
--- a/examples/hwapi/hwconfig_dragonboard410c.py
+++ b/examples/hwapi/hwconfig_dragonboard410c.py
@@ -1,4 +1,4 @@
-from machine import Pin
+from machine import Pin, Signal
 
 # 96Boards/Qualcomm DragonBoard 410c
 #
diff --git a/examples/hwapi/hwconfig_z_frdm_k64f.py b/examples/hwapi/hwconfig_z_frdm_k64f.py
index 583e8d7aa4..6313e2ddb5 100644
--- a/examples/hwapi/hwconfig_z_frdm_k64f.py
+++ b/examples/hwapi/hwconfig_z_frdm_k64f.py
@@ -1,4 +1,4 @@
-from machine import Pin
+from machine import Pin, Signal
 
 # Freescale/NXP FRDM-K64F board
 # Blue LED on port B, pin 21