diff --git a/test/sd_test/sd_test.c b/test/sd_test/sd_test.c
index a971df9..51da467 100644
--- a/test/sd_test/sd_test.c
+++ b/test/sd_test/sd_test.c
@@ -10,6 +10,7 @@
 
 #include "pico/stdlib.h"
 #include "pico/sd_card.h"
+#include "hardware/clocks.h"
 
 static uint8_t sector_data[1024];