diff --git a/sys/arm/include/fdt.h b/sys/arm/include/fdt.h
index 3672dfb2b25f..c7290aca129e 100644
--- a/sys/arm/include/fdt.h
+++ b/sys/arm/include/fdt.h
@@ -44,6 +44,9 @@
 /* Max interrupt number */
 #define FDT_INTR_MAX	NIRQ
 
+/* Map phandle/intpin pair to global IRQ number */ 
+#define	FDT_MAP_IRQ(node, pin)	(pin)
+
 /*
  * Bus space tag. XXX endianess info needs to be derived from the blob.
  */
diff --git a/sys/dev/fdt/fdt_common.c b/sys/dev/fdt/fdt_common.c
index b4e006359a8c..d25715b12410 100644
--- a/sys/dev/fdt/fdt_common.c
+++ b/sys/dev/fdt/fdt_common.c
@@ -480,7 +480,7 @@ fdt_intr_to_rl(phandle_t node, struct resource_list *rl,
 	pcell_t *intr;
 	pcell_t intr_cells;
 	int interrupt, trig, pol;
-	int i, intr_num, rv;
+	int i, intr_num, irq, rv;
 
 	if (OF_getproplen(node, "interrupts") <= 0)
 		/* Node does not have 'interrupts' property. */
@@ -532,7 +532,8 @@ fdt_intr_to_rl(phandle_t node, struct resource_list *rl,
 		intr_sl[i].trig = trig;
 		intr_sl[i].pol = pol;
 
-		resource_list_add(rl, SYS_RES_IRQ, i, interrupt, interrupt, 1);
+		irq = FDT_MAP_IRQ(intr_par, interrupt);
+		resource_list_add(rl, SYS_RES_IRQ, i, irq, irq, 1);
 	}
 
 out:
diff --git a/sys/powerpc/include/fdt.h b/sys/powerpc/include/fdt.h
index 76ef94fc57a1..116f562af02a 100644
--- a/sys/powerpc/include/fdt.h
+++ b/sys/powerpc/include/fdt.h
@@ -38,6 +38,9 @@
 /* Max interrupt number */
 #define FDT_INTR_MAX	INTR_VECTORS
 
+/* Map phandle/intpin pair to global IRQ number */
+#define	FDT_MAP_IRQ(node, pin)	powerpc_get_irq(node, pin)
+
 /*
  * Bus space tag. XXX endianess info needs to be derived from the blob.
  */