diff --git a/build/tasks/kernel.mk b/build/tasks/kernel.mk
index 9bcbce3..dce587d 100644
--- a/build/tasks/kernel.mk
+++ b/build/tasks/kernel.mk
@@ -259,6 +259,10 @@
 # System tools are no longer allowed on 10+
 PATH_OVERRIDE += $(TOOLS_PATH_OVERRIDE)
 
+ifeq (true,$(filter true, $(TARGET_NEEDS_DTBOIMAGE) $(BOARD_KERNEL_SEPARATED_DTBO)))
+    KERNEL_MAKE_FLAGS += DTC_EXT=$(KERNEL_BUILD_OUT_PREFIX)$(DTC)
+endif
+
 # Internal implementation of make-kernel-target
 # $(1): output path (The value passed to O=)
 # $(2): target to build (eg. defconfig, modules, dtbo.img)