diff --git a/debian/changelog b/debian/changelog
index 54874252..462f474e 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+llvm-toolchain-9 (1:9.0.1-16) UNRELEASED; urgency=low
+
+  * Replace use of deprecated $ADTTMP with $AUTOPKGTEST_TMP.
+
+ -- Sylvestre Ledru <sylvestre@debian.org>  Fri, 23 Oct 2020 09:32:39 -0000
+
 llvm-toolchain-9 (1:9.0.1-15) unstable; urgency=medium
 
   * Ensure fixfilepath feature is disabled.  The fixfilepath
diff --git a/debian/tests/cmake-test b/debian/tests/cmake-test
index c9f26699..4e774f1f 100755
--- a/debian/tests/cmake-test
+++ b/debian/tests/cmake-test
@@ -3,18 +3,18 @@
 set -e
 
 # this is taken from libjsoncpp package
-# Presence of $ADTTMP implies that someone will handle cleanup for us, so we
+# Presence of $AUTOPKGTEST_TMP implies that someone will handle cleanup for us, so we
 # can avoid duplicating the effort (signal handling, etc.) here.
-if [ -z "$ADTTMP" ]
+if [ -z "$AUTOPKGTEST_TMP" ]
 then
-	echo "Required envvar ADTTMP \"$ADTTMP\" is not set" >&2
+	echo "Required envvar AUTOPKGTEST_TMP \"$AUTOPKGTEST_TMP\" is not set" >&2
 	exit 1
 fi
 
 
 # the idea was taken from spirv-llvm-translator package
 
-cd "$ADTTMP"
+cd "$AUTOPKGTEST_TMP"
 cat <<EOF > CMakeLists.txt
 cmake_minimum_required(VERSION 2.6.2)
 project(cmake-test)