diff --git a/generic-dts/Makefile b/generic-dts/Makefile
index a0639f1..2915a71 100644
--- a/generic-dts/Makefile
+++ b/generic-dts/Makefile
@@ -13,7 +13,7 @@ include $(oottree)/scripts/Makefile.lib
 
 DTC_CPP_FLAGS += $(EXTRA_CPP_FLAGS)
 
-DTC_CPP_FLAGS += -DLINUX_VERSION=600 -DTEGRA_HOST1X_DT_VERSION=2
+DTC_CPP_FLAGS += -DLINUX_VERSION=600 -DTEGRA_HOST1X_DT_VERSION=2 -DOS_LINUX
 
 ifneq ($(findstring ack_src,$(NV_BUILD_KERNEL_OPTIONS)),)
 ifneq ($(TOP),)
diff --git a/legacy-dts/Makefile b/legacy-dts/Makefile
index a458475..035f73f 100644
--- a/legacy-dts/Makefile
+++ b/legacy-dts/Makefile
@@ -17,7 +17,7 @@ DTC_FLAGS += -Wno-graph_endpoint
 
 DTC_CPP_FLAGS += $(EXTRA_CPP_FLAGS)
 
-DTC_CPP_FLAGS += -DLINUX_VERSION=600 -DTEGRA_HOST1X_DT_VERSION=2
+DTC_CPP_FLAGS += -DLINUX_VERSION=600 -DTEGRA_HOST1X_DT_VERSION=2 -DOS_LINUX
 
 ifneq ($(findstring ack_src,$(NV_BUILD_KERNEL_OPTIONS)),)
 ifneq ($(TOP),)