diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index 0daaff2..4d54f33 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -1,3 +1,4 @@
+KBUILD_DEFCONFIG := qemu_virt64_defconfig
 
 CPPFLAGS	+= -D__ARM__ -fno-strict-aliasing
 # Explicitly specifiy 32-bit ARM ISA since toolchain default can be -mthumb:
diff --git a/arch/blackfin/Makefile b/arch/blackfin/Makefile
index 381c6a9..5c43bf7 100644
--- a/arch/blackfin/Makefile
+++ b/arch/blackfin/Makefile
@@ -1,3 +1,4 @@
+KBUILD_DEFCONFIG := ipe337_defconfig
 
 CPPFLAGS += -fno-strict-aliasing
 
diff --git a/arch/mips/Makefile b/arch/mips/Makefile
index 6f1a1ce..ee465dc 100644
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -1,3 +1,5 @@
+KBUILD_DEFCONFIG := qemu-malta_defconfig
+
 #
 # Select the object file format to substitute into the linker script.
 #
diff --git a/arch/nios2/Makefile b/arch/nios2/Makefile
index 3e97155..0dff0be 100644
--- a/arch/nios2/Makefile
+++ b/arch/nios2/Makefile
@@ -1,3 +1,5 @@
+KBUILD_DEFCONFIG := generic_defconfig
+
 CPPFLAGS += -fno-strict-aliasing -mno-hw-mul
 
 board-$(CONFIG_GENERIC) := generic
diff --git a/arch/openrisc/Makefile b/arch/openrisc/Makefile
index b0c8566..5394afb 100644
--- a/arch/openrisc/Makefile
+++ b/arch/openrisc/Makefile
@@ -1,3 +1,5 @@
+KBUILD_DEFCONFIG := generic_defconfig
+
 CPPFLAGS += -D__OR1K__ -ffixed-r10 -mhard-mul -mhard-div
 
 board-$(CONFIG_GENERIC) := generic