diff --git a/resolve-debbuilddeps.sh b/resolve-debbuilddeps.sh
index 19363ce..3f6a043 100755
--- a/resolve-debbuilddeps.sh
+++ b/resolve-debbuilddeps.sh
@@ -15,10 +15,10 @@ SCHROOTNAME="$1"
 sed 's,@[^@]*@, dummytext,g' debian/control.in > debian/control
 
 if test -n "${SCHROOTNAME}"; then
-  schroot -c "${SCHROOTNAME}" -- apt-get install -y dpkg-dev
+  schroot -c "${SCHROOTNAME}" -u root -d / -- apt-get install -y dpkg-dev
   DEPS=$(schroot -c "${SCHROOTNAME}" -- dpkg-checkbuilddeps 2>&1 || true)
 else
-  apt-get install -y dpkg-dev
+  sudo apt-get install -y dpkg-dev
   DEPS=$(dpkg-checkbuilddeps 2>&1 || true)
 fi
 DEPS=$(echo "$DEPS" | sed -n '/Unmet build dependencies/ { s,.*Unmet build dependencies: ,,g; s, ([^)]*),,g; s, *| *,|,g; p}')