diff --git a/drivers/ioexpander/gpio_lower_half.c b/drivers/ioexpander/gpio_lower_half.c
index b59d3a1d04..8445b25545 100644
--- a/drivers/ioexpander/gpio_lower_half.c
+++ b/drivers/ioexpander/gpio_lower_half.c
@@ -26,6 +26,7 @@
 
 #include <sys/types.h>
 #include <assert.h>
+#include <debug.h>
 #include <errno.h>
 
 #include <nuttx/kmalloc.h>