diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 1ca4dcd2d500..7dee1da83e2a 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -264,7 +264,7 @@ cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -n -f -9 > $@) || \
 DTC ?= $(objtree)/scripts/dtc/dtc
 
 # Disable noisy checks by default
-ifeq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),)
+ifeq ($(findstring 1,$(KBUILD_ENABLE_EXTRA_GCC_CHECKS)),)
 DTC_FLAGS += -Wno-unit_address_vs_reg \
 	-Wno-simple_bus_reg \
 	-Wno-unit_address_format \
@@ -273,7 +273,7 @@ DTC_FLAGS += -Wno-unit_address_vs_reg \
 	-Wno-pci_device_reg
 endif
 
-ifeq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),2)
+ifneq ($(findstring 2,$(KBUILD_ENABLE_EXTRA_GCC_CHECKS)),)
 DTC_FLAGS += -Wnode_name_chars_strict \
 	-Wproperty_name_chars_strict
 endif