diff --git a/configure b/configure
index 3a785ce946..ee66707acd 100755
--- a/configure
+++ b/configure
@@ -845,7 +845,7 @@ fi
 echo -n "Creating mk/config.mk..."
 cp -f $rootdir/CONFIG $rootdir/mk/config.mk
 for key in "${!CONFIG[@]}"; do
-	sed -i.bak -r "s#^\s*CONFIG_${key}=.*#CONFIG_${key}\?=${CONFIG[$key]}#g" $rootdir/mk/config.mk
+	sed -i.bak -r "s#[[:space:]]*CONFIG_${key}=.*#CONFIG_${key}\?=${CONFIG[$key]}#g" $rootdir/mk/config.mk
 done
 # On FreeBSD sed -i 'SUFFIX' - SUFFIX is mandatory. So no way but to delete the backed file.
 rm -f $rootdir/mk/config.mk.bak
diff --git a/dpdkbuild/Makefile b/dpdkbuild/Makefile
index b540d2fa08..d4af3a0a45 100644
--- a/dpdkbuild/Makefile
+++ b/dpdkbuild/Makefile
@@ -137,7 +137,7 @@ ifeq ($(MAKE_PID),)
 MAKE_PID := $(shell echo $$PPID)
 endif
 
-MAKE_NUMJOBS := $(shell ps T | sed -nE 's/\s*$(MAKE_PID)\s.* (-j|--jobs=)( *[0-9]+).*/\1\2/p')
+MAKE_NUMJOBS := $(shell ps T | sed -nE 's/[[:space:]]*$(MAKE_PID)[[:space:]].* (-j|--jobs=)( *[0-9]+).*/\1\2/p')
 
 all: $(SPDK_ROOT_DIR)/dpdk/build-tmp
 	$(Q)# DPDK doesn't handle nested make calls, so unset MAKEFLAGS