diff --git a/target/imagebuilder/Makefile b/target/imagebuilder/Makefile
index 5d7b7ab5e..a9480ef84 100644
--- a/target/imagebuilder/Makefile
+++ b/target/imagebuilder/Makefile
@@ -12,8 +12,8 @@ include $(INCLUDE_DIR)/version.mk
 
 override MAKEFLAGS=
 
-PKG_OS:=$(shell uname -s)
-PKG_CPU:=$(shell uname -m | sed "s/ //g")
+PKG_OS:=$(word 2,$(subst -, ,$(shell $(HOSTCC) -dumpmachine)))
+PKG_CPU:=$(word 1,$(subst -, ,$(shell $(HOSTCC) -dumpmachine)))
 
 IB_NAME:=OpenWrt-ImageBuilder-$(BOARD)$(if $(SUBTARGET),_$(SUBTARGET))-for-$(PKG_OS)-$(PKG_CPU)
 PKG_BUILD_DIR:=$(BUILD_DIR)/$(IB_NAME)
diff --git a/target/sdk/Makefile b/target/sdk/Makefile
index 99177984e..51bf47b42 100644
--- a/target/sdk/Makefile
+++ b/target/sdk/Makefile
@@ -11,8 +11,8 @@ include $(INCLUDE_DIR)/host.mk
 
 override MAKEFLAGS=
 
-PKG_OS:=$(shell uname -s)
-PKG_CPU:=$(shell uname -m)
+PKG_OS:=$(word 2,$(subst -, ,$(shell $(HOSTCC) -dumpmachine)))
+PKG_CPU:=$(word 1,$(subst -, ,$(shell $(HOSTCC) -dumpmachine)))
 
 SDK_NAME:=OpenWrt-SDK-$(BOARD)-for-$(PKG_OS)-$(PKG_CPU)-gcc-$(GCCV)_$(LIBC)-$(LIBCV)
 SDK_BUILD_DIR:=$(BUILD_DIR)/$(SDK_NAME)
diff --git a/target/toolchain/Makefile b/target/toolchain/Makefile
index 0db18d1ac..20f753a27 100644
--- a/target/toolchain/Makefile
+++ b/target/toolchain/Makefile
@@ -13,8 +13,8 @@ include $(INCLUDE_DIR)/host.mk
 
 override MAKEFLAGS=
 
-PKG_OS:=$(shell uname -s)
-PKG_CPU:=$(shell uname -m)
+PKG_OS:=$(word 2,$(subst -, ,$(shell $(HOSTCC) -dumpmachine)))
+PKG_CPU:=$(word 1,$(subst -, ,$(shell $(HOSTCC) -dumpmachine)))
 
 TOOLCHAIN_NAME:=OpenWrt-Toolchain-$(BOARD)-for-$(ARCH)$(ARCH_SUFFIX)-gcc-$(GCCV)$(DIR_SUFFIX)
 TOOLCHAIN_BUILD_DIR:=$(BUILD_DIR)/$(TOOLCHAIN_NAME)