diff --git a/bsps/or1k/generic_or1k/clock/clockdrv.c b/bsps/or1k/generic_or1k/clock/clockdrv.c
index 1f88ecc641..7544da31fd 100644
--- a/bsps/or1k/generic_or1k/clock/clockdrv.c
+++ b/bsps/or1k/generic_or1k/clock/clockdrv.c
@@ -132,6 +132,6 @@ static void generic_or1k_clock_initialize(void)
 #define Clock_driver_support_initialize_hardware() generic_or1k_clock_initialize()
 
 #define Clock_driver_support_install_isr(isr) \
-  generic_or1k_clock_handler_install(isr)
+  generic_or1k_clock_handler_install((CPU_ISR_handler) isr)
 
 #include "../../../shared/dev/clock/clockimpl.h"