diff --git a/go/rawcuml4go/device_memory.go b/go/rawcuml4go/device_memory.go
index c0ee014..0c35cda 100644
--- a/go/rawcuml4go/device_memory.go
+++ b/go/rawcuml4go/device_memory.go
@@ -70,7 +70,7 @@ func UseArenaMemoryResource(arena_size uint64) (
 	error,
 ) {
 	var pointer C.DeviceMemoryResource
-	ret := C.UseArenaMemoryResource(&pointer, arena_size)
+	ret := C.UseArenaMemoryResource(&pointer, (C.size_t)(arena_size))
 	if ret != 0 {
 		return nil, ErrGetDeviceMemoryResource
 	}