diff --git a/camkes/templates/component.simple.c b/camkes/templates/component.simple.c
index 574babf4..66fd0132 100644
--- a/camkes/templates/component.simple.c
+++ b/camkes/templates/component.simple.c
@@ -482,7 +482,13 @@ void camkes_make_simple(simple_t *simple) {
             /*# If there is no size specified in the configuration then we assume the cnode
                 will be as small as possible to hold all the capabilities that are currently
                 defined #*/
-            simple_data.cnodesizebits = CONFIG_WORD_SIZE - __builtin_clz(/*? holding_slot ?*/) + 1;
+#if CONFIG_WORD_SIZE == 32
+                simple_data.cnodesizebits = CONFIG_WORD_SIZE - __builtin_clzl(/*? holding_slot ?*/) + 1;
+#elif CONFIG_WORD_SIZE == 64
+                simple_data.cnodesizebits = CONFIG_WORD_SIZE - __builtin_clzll(/*? holding_slot ?*/) + 1;
+#else
+    #error "Unknown kernel word size"
+#endif
         /*- endif -*/
         /*# Find untyped physical addresses. We only care if the untyped is at least a page size #*/
         /*- for u in untyped_obj_list -*/