diff --git a/recipes-extended/irqbalance/files/set_irq_max_core.sh b/recipes-extended/irqbalance/files/set_irq_max_core.sh
index 3d59d0ac..a0a34112 100755
--- a/recipes-extended/irqbalance/files/set_irq_max_core.sh
+++ b/recipes-extended/irqbalance/files/set_irq_max_core.sh
@@ -1,6 +1,6 @@
 #!/bin/bash -e
 
-MAX_CPU_CORE=$(($(nproc) - 1))
+MAX_CPU_CORE=$(($(nproc --all) - 1))
 CPU_BAN_LIST=$(grep 'IRQBALANCE_BANNED_CPULIST' /etc/irqbalance.env | awk -F= '{print $2}')
 
 if echo "$CPU_BAN_LIST" | grep -q 'N'; then