diff --git a/sound/soc/tegra-alt/Makefile b/sound/soc/tegra-alt/Makefile
index f111f0da..954f28d4 100644
--- a/sound/soc/tegra-alt/Makefile
+++ b/sound/soc/tegra-alt/Makefile
@@ -1,4 +1,4 @@
-KBUILD_CFLAGS += -I$(srctree)/../kernel-3.18/sound/soc/tegra-alt
+KBUILD_CFLAGS += -I$(srctree)/sound/soc/tegra-alt
 
 snd-soc-tegra186-alt-asrc-objs := tegra186_asrc_alt.o
 snd-soc-tegra186-alt-arad-objs := tegra186_arad_alt.o
@@ -10,7 +10,9 @@ obj-$(CONFIG_SND_SOC_TEGRA186_ARAD_ALT) += snd-soc-tegra186-alt-arad.o
 obj-$(CONFIG_SND_SOC_TEGRA210_AFC_ALT) += snd-soc-tegra186-alt-afc.o
 obj-$(CONFIG_SND_SOC_TEGRA210_XBAR_ALT) += snd-soc-tegra186-alt-xbar.o
 
+# The funky manipulation of $(srctree) is for dynamically finding the name of
+# the kernel root dir.
 snd-soc-tegra-alt-t186ref-objs := tegra_t186ref_alt.o tegra_asoc_machine_alt_t18x.o \
-	../../../../kernel-3.18/sound/soc/tegra-alt/tegra_asoc_machine_alt.o
+	../../../../$(lastword $(subst /, ,$(srctree)))/sound/soc/tegra-alt/tegra_asoc_machine_alt.o
 
 obj-$(CONFIG_SND_SOC_TEGRA_T186REF_ALT) += snd-soc-tegra-alt-t186ref.o