diff --git a/c/src/lib/libbsp/sparc64/shared/clock/ckinit.c b/c/src/lib/libbsp/sparc64/shared/clock/ckinit.c
index 39011661fe..fbebcbd012 100644
--- a/c/src/lib/libbsp/sparc64/shared/clock/ckinit.c
+++ b/c/src/lib/libbsp/sparc64/shared/clock/ckinit.c
@@ -19,6 +19,7 @@
 #include <bsp.h>
 #include <bspopts.h>
 #include <boot/ofw.h>
+#include <rtems/bspIo.h>
 
 /* This is default frequency for simics simulator of niagara. Use the
  * get_Frequency function to determine the CPU clock frequency at runtime.