diff --git a/Makefile b/Makefile
index 5f90cea..b1aba35 100644
--- a/Makefile
+++ b/Makefile
@@ -1864,6 +1864,7 @@
 		$(CPP) -P $(cpp_flags) -x assembler-with-cpp -undef \
 			-D__ASSEMBLY__ \
 			-D__UBOOT_CONFIG__ \
+			-DDEFAULT_DEVICE_TREE=$(subst ",,$(CONFIG_DEFAULT_DEVICE_TREE)) \
 			-I . -I include -I $(srctree)/include \
 			-include linux/kconfig.h -include include/config.h \
 			-I$(srctree)/arch/$(ARCH)/include \
diff --git a/doc/usage/environment.rst b/doc/usage/environment.rst
index 30fc167..7e2f286 100644
--- a/doc/usage/environment.rst
+++ b/doc/usage/environment.rst
@@ -87,6 +87,18 @@
 
    #include <env/ti/mmc.env>
 
+Quotes are not suppressed, for example::
+
+    fdtfile=CONFIG_DEFAULT_DEVICE_TREE.dtb
+    # produces: fdtfile="sun7i-a20-pcduino3.dtb"
+
+For this particular issue you can use ``DEFAULT_DEVICE_TREE`` instead::
+
+    fdtfile=DEFAULT_DEVICE_TREE.dtb
+    # produces: fdtfile=sun7i-a20-pcduino3.dtb
+
+There is no general way to remove quotes.
+
 If CONFIG_ENV_SOURCE_FILE is empty and the default filename is not present, then
 the old-style C environment is used instead. See below.