diff --git a/include/ircd/simt/reduce_max.h b/include/ircd/simt/reduce_max.h
index 5394fc04b..7c10beacc 100644
--- a/include/ircd/simt/reduce_max.h
+++ b/include/ircd/simt/reduce_max.h
@@ -30,3 +30,23 @@ ircd_simt_reduce_max_flldr(__local float *const buf,
 	}
 }
 #endif
+
+#ifdef __OPENCL_VERSION__
+inline void
+ircd_simt_reduce_max_illdr(__local int *const buf,
+                           const uint ln,
+                           const uint li)
+{
+	buf[li] = atomic_max(buf, buf[li]);
+}
+#endif
+
+#ifdef __OPENCL_VERSION__
+inline void
+ircd_simt_reduce_max_ulldr(__local uint *const buf,
+                           const uint ln,
+                           const uint li)
+{
+	buf[li] = atomic_max(buf, buf[li]);
+}
+#endif