diff --git a/include/haproxy/cpuset.h b/include/haproxy/cpuset.h
index e5e176368..0ff0f5c11 100644
--- a/include/haproxy/cpuset.h
+++ b/include/haproxy/cpuset.h
@@ -23,6 +23,10 @@ int ha_cpuset_clr(struct hap_cpuset *set, int cpu);
  */
 void ha_cpuset_and(struct hap_cpuset *dst, struct hap_cpuset *src);
 
+/* Bitwise OR equivalent operation between <src> and <dst> stored in <dst>.
+ */
+void ha_cpuset_or(struct hap_cpuset *dst, struct hap_cpuset *src);
+
 /* returns non-zero if CPU index <cpu> is set in <set>, otherwise 0. */
 int ha_cpuset_isset(const struct hap_cpuset *set, int cpu);
 
diff --git a/src/cpuset.c b/src/cpuset.c
index b6820fe15..acc61f170 100644
--- a/src/cpuset.c
+++ b/src/cpuset.c
@@ -60,6 +60,19 @@ void ha_cpuset_and(struct hap_cpuset *dst, struct hap_cpuset *src)
 #endif
 }
 
+void ha_cpuset_or(struct hap_cpuset *dst, struct hap_cpuset *src)
+{
+#if defined(CPUSET_USE_CPUSET)
+	CPU_OR(&dst->cpuset, &dst->cpuset, &src->cpuset);
+
+#elif defined(CPUSET_USE_FREEBSD_CPUSET)
+	CPU_OR(&dst->cpuset, &src->cpuset);
+
+#elif defined(CPUSET_USE_ULONG)
+	dst->cpuset |= src->cpuset;
+#endif
+}
+
 int ha_cpuset_isset(const struct hap_cpuset *set, int cpu)
 {
 	if (cpu >= ha_cpuset_size())