diff --git a/src/soc/intel/tigerlake/fsp_params.c b/src/soc/intel/tigerlake/fsp_params.c
index 1cf3d2fee8..e3c7879902 100644
--- a/src/soc/intel/tigerlake/fsp_params.c
+++ b/src/soc/intel/tigerlake/fsp_params.c
@@ -93,6 +93,14 @@ static void parse_devicetree(FSP_S_CONFIG *params)
  * regardless of whether or not they are used by the mainboard.
  */
 static const struct slot_irq_constraints irq_constraints[] = {
+	{
+		.slot = SA_DEV_SLOT_PEG,
+		.fns = {
+			FIXED_INT_PIRQ(SA_DEVFN_PEG1, PCI_INT_A, PIRQ_A),
+			FIXED_INT_PIRQ(SA_DEVFN_PEG2, PCI_INT_B, PIRQ_B),
+			FIXED_INT_PIRQ(SA_DEVFN_PEG3, PCI_INT_C, PIRQ_C),
+		},
+	},
 	{
 		.slot = SA_DEV_SLOT_IGD,
 		.fns = {