diff --git a/buildtools/gen-build-mk.sh b/buildtools/gen-build-mk.sh
index c18b205e32..636920b638 100755
--- a/buildtools/gen-build-mk.sh
+++ b/buildtools/gen-build-mk.sh
@@ -5,7 +5,6 @@
 # Auto-generate a Makefile in build directory
 # Args:
 #   $1: path of project src root
-#   $2: path of build dir (can be relative to $1)
 
 echo "# Automatically generated by gen-build-mk.sh"
 echo
@@ -18,7 +17,7 @@ echo
 echo "MAKEFLAGS += --no-print-directory"
 echo
 echo "all:"
-echo "	@\$(MAKE) -C $1 O=$2"
+echo "	@\$(MAKE) -C $1 O=\$(CURDIR)"
 echo
 echo "%::"
-echo "	@\$(MAKE) -C $1 O=$2 \$@"
+echo "	@\$(MAKE) -C $1 O=\$(CURDIR) \$@"
diff --git a/mk/rte.sdkconfig.mk b/mk/rte.sdkconfig.mk
index d90d62cc6a..fa77331cbb 100644
--- a/mk/rte.sdkconfig.mk
+++ b/mk/rte.sdkconfig.mk
@@ -114,8 +114,7 @@ SDK_RELPATH=$(shell $(RTE_SDK)/buildtools/relpath.sh $(abspath $(RTE_SRCDIR)) \
 OUTPUT_RELPATH=$(shell $(RTE_SDK)/buildtools/relpath.sh $(abspath $(RTE_OUTPUT)) \
 				$(abspath $(RTE_SRCDIR)))
 $(RTE_OUTPUT)/Makefile: | $(RTE_OUTPUT)
-	$(Q)$(RTE_SDK)/buildtools/gen-build-mk.sh $(SDK_RELPATH) $(OUTPUT_RELPATH) \
-		> $(RTE_OUTPUT)/Makefile
+	$(Q)$(RTE_SDK)/buildtools/gen-build-mk.sh $(SDK_RELPATH) > $@
 
 # clean installed files, and generate a new config header file
 # if NODOTCONF variable is defined, don't try to rebuild .config