diff --git a/sw/runtime/src/cluster_interrupts.h b/sw/runtime/src/cluster_interrupts.h
index 764b92bf14..42e3f404ad 100644
--- a/sw/runtime/src/cluster_interrupts.h
+++ b/sw/runtime/src/cluster_interrupts.h
@@ -12,8 +12,7 @@
  * @param cluster_idx Index of the cluster to which the interrupt is sent
  */
 inline void snrt_int_cluster_set(uint32_t mask, uint32_t cluster_idx) {
-    snrt_cluster(cluster_idx)->peripheral_reg.cl_clint_set.f.cl_clint_set =
-        mask;
+    snrt_cluster(cluster_idx)->peripheral_reg.cl_clint_set.w = (uint64_t)mask;
 }
 
 /**