diff --git a/make_helpers/plat_helpers.mk b/make_helpers/plat_helpers.mk
index a2f383a..a7ae9a2 100644
--- a/make_helpers/plat_helpers.mk
+++ b/make_helpers/plat_helpers.mk
@@ -15,14 +15,14 @@
         $(error "Error: Unknown platform. Please use PLAT=<platform name> to specify the platform")
     endif
 
-    # PLATFORM_ROOT can be overridden for when building tools directly
-    PLATFORM_ROOT               ?= plat/
+    # TF_PLATFORM_ROOT can be overridden for when building tools directly
+    TF_PLATFORM_ROOT               ?= plat/
     PLAT_MAKEFILE               := platform.mk
 
     # Generate the platforms list by recursively searching for all directories
     # under /plat containing a PLAT_MAKEFILE. Append each platform with a `|`
     # char and strip out the final '|'.
-    ALL_PLATFORM_MK_FILES       := $(call rwildcard,${PLATFORM_ROOT},${PLAT_MAKEFILE})
+    ALL_PLATFORM_MK_FILES       := $(call rwildcard,${TF_PLATFORM_ROOT},${PLAT_MAKEFILE})
     ALL_PLATFORM_DIRS           := $(patsubst %/,%,$(dir ${ALL_PLATFORM_MK_FILES}))
     ALL_PLATFORMS               := $(sort $(notdir ${ALL_PLATFORM_DIRS}))