diff --git a/.gitignore b/.gitignore
index 33014811926..d9a64d742fd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -63,6 +63,7 @@ fit-dtb.blob*
 /spl/
 /tpl/
 /defconfig
+/generated_defconfig
 
 #
 # Generated include files
diff --git a/Makefile b/Makefile
index 28a2a1d98c4..91afee668e3 100644
--- a/Makefile
+++ b/Makefile
@@ -2233,6 +2233,7 @@ clean: $(clean-dirs)
 		-o -name modules.builtin -o -name '.tmp_*.o.*' \
 		-o -name 'dsdt_generated.aml' -o -name 'dsdt_generated.asl.tmp' \
 		-o -name 'dsdt_generated.c' \
+		-o -name 'generated_defconfig' \
 		-o -name '*.efi' -o -name '*.gcno' -o -name '*.so' \) \
 		-type f -print | xargs rm -f
 
diff --git a/scripts/kconfig/Makefile b/scripts/kconfig/Makefile
index 5ce5845e824..079add4d5da 100644
--- a/scripts/kconfig/Makefile
+++ b/scripts/kconfig/Makefile
@@ -93,7 +93,7 @@ endif
 endif
 
 %_defconfig: $(obj)/conf
-	$(Q)$(CPP) -nostdinc -I $(srctree) -undef -x assembler-with-cpp $(srctree)/arch/$(SRCARCH)/configs/$@ -o generated_defconfig
+	$(Q)$(CPP) -nostdinc -P -I $(srctree) -undef -x assembler-with-cpp $(srctree)/arch/$(SRCARCH)/configs/$@ -o generated_defconfig
 	$(Q)$< $(silent) --defconfig=generated_defconfig $(Kconfig)
 
 # Added for U-Boot (backward compatibility)