diff --git a/src/mainboard/google/brya/variants/baseboard/trulo/devicetree.cb b/src/mainboard/google/brya/variants/baseboard/trulo/devicetree.cb
index 3d0b9d7d3a..8a20256f51 100644
--- a/src/mainboard/google/brya/variants/baseboard/trulo/devicetree.cb
+++ b/src/mainboard/google/brya/variants/baseboard/trulo/devicetree.cb
@@ -91,7 +91,7 @@ chip soc/intel/alderlake
 		device ref tcss_xhci on end
 		device ref ish on
 			chip drivers/intel/ish
-				register "firmware_name" = ""trulo-ish.bin""
+				register "firmware_name" = ""trulo_ish.bin""
 				register "add_acpi_dma_property" = "true"
 				device generic 0 on end
 			end