diff --git a/.travis.yml b/.travis.yml
index 67090ce..a23c8d2 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,7 +17,6 @@ jobs:
           env:
               - DEBIAN_RELEASE="testing"
               - CONT_NAME="libbpf-debian-$DEBIAN_RELEASE"
-              - DOCKER_EXEC="docker exec -ti $CONT_NAME"
           before_install:
               - sudo apt-get -y -o Dpkg::Options::="--force-confnew" install docker-ce
               - docker --version
@@ -35,7 +34,6 @@ jobs:
           env:
               - DEBIAN_RELEASE="testing"
               - CONT_NAME="libbpf-debian-$DEBIAN_RELEASE"
-              - DOCKER_EXEC="docker exec -ti $CONT_NAME"
           before_install:
               - sudo apt-get -y -o Dpkg::Options::="--force-confnew" install docker-ce
               - docker --version
@@ -53,7 +51,6 @@ jobs:
           env:
               - DEBIAN_RELEASE="testing"
               - CONT_NAME="libbpf-debian-$DEBIAN_RELEASE"
-              - DOCKER_EXEC="docker exec -ti $CONT_NAME"
           before_install:
               - sudo apt-get -y -o Dpkg::Options::="--force-confnew" install docker-ce
               - docker --version
@@ -71,7 +68,6 @@ jobs:
           env:
               - DEBIAN_RELEASE="testing"
               - CONT_NAME="libbpf-debian-$DEBIAN_RELEASE"
-              - DOCKER_EXEC="docker exec -ti $CONT_NAME"
           before_install:
               - sudo apt-get -y -o Dpkg::Options::="--force-confnew" install docker-ce
               - docker --version
@@ -83,6 +79,7 @@ jobs:
               - set +e
           after_script:
               - $CI_MANAGERS/debian.sh CLEANUP
+
         - name: Ubuntu Xenial
           language: bash
           script:
diff --git a/travis-ci/managers/debian.sh b/travis-ci/managers/debian.sh
index c3789c4..54318de 100755
--- a/travis-ci/managers/debian.sh
+++ b/travis-ci/managers/debian.sh
@@ -3,15 +3,20 @@
 PHASES=(${@:-SETUP RUN RUN_ASAN CLEANUP})
 DEBIAN_RELEASE="${DEBIAN_RELEASE:-testing}"
 CONT_NAME="${CONT_NAME:-debian-$DEBIAN_RELEASE-$RANDOM}"
-DOCKER_EXEC="${DOCKER_EXEC:-docker exec -it $CONT_NAME}"
+ENV_VARS="${ENV_VARS:-}"
 DOCKER_RUN="${DOCKER_RUN:-docker run}"
 REPO_ROOT="${REPO_ROOT:-$PWD}"
-ADDITIONAL_DEPS=(clang)
+ADDITIONAL_DEPS=(clang pkg-config)
+CFLAGS="-g -O2 -Werror -Wall"
 
 function info() {
     echo -e "\033[33;1m$1\033[0m"
 }
 
+function docker_exec() {
+    docker exec $ENV_VARS -it $CONT_NAME "$@"
+}
+
 set -e
 
 source "$(dirname $0)/travis_wait.bash"
@@ -26,27 +31,32 @@ for phase in "${PHASES[@]}"; do
             $DOCKER_RUN -v $REPO_ROOT:/build:rw \
                         -w /build --privileged=true --name $CONT_NAME \
 			-dit --net=host debian:$DEBIAN_RELEASE /bin/bash
-            $DOCKER_EXEC bash -c "echo deb-src http://deb.debian.org/debian $DEBIAN_RELEASE main >>/etc/apt/sources.list"
-            $DOCKER_EXEC apt-get -y update
-            $DOCKER_EXEC apt-get -y build-dep libelf-dev
-            $DOCKER_EXEC apt-get -y install libelf-dev
-            $DOCKER_EXEC apt-get -y install "${ADDITIONAL_DEPS[@]}"
+            docker_exec bash -c "echo deb-src http://deb.debian.org/debian $DEBIAN_RELEASE main >>/etc/apt/sources.list"
+            docker_exec apt-get -y update
+            docker_exec apt-get -y build-dep libelf-dev
+            docker_exec apt-get -y install libelf-dev
+            docker_exec apt-get -y install "${ADDITIONAL_DEPS[@]}"
             ;;
         RUN|RUN_CLANG)
             if [[ "$phase" = "RUN_CLANG" ]]; then
                 ENV_VARS="-e CC=clang -e CXX=clang++"
+                CC="clang"
             fi
-            docker exec $ENV_VARS -it $CONT_NAME mkdir build
-            $DOCKER_EXEC make CFLAGS='-Werror' -C ./src -B OBJDIR=../build
-            $DOCKER_EXEC rm -rf build
+            docker_exec mkdir build
+            docker_exec ${CC:-cc} --version
+            docker_exec make CFLAGS="${CFLAGS}" -C ./src -B OBJDIR=../build
+            docker_exec rm -rf build
             ;;
         RUN_ASAN|RUN_CLANG_ASAN)
             if [[ "$phase" = "RUN_CLANG_ASAN" ]]; then
                 ENV_VARS="-e CC=clang -e CXX=clang++"
+                CC="clang"
             fi
-            docker exec $ENV_VARS -it $CONT_NAME mkdir build
-            $DOCKER_EXEC make CFLAGS='-Werror -Db_sanitize=address,undefined' -C ./src -B OBJDIR=../build
-            $DOCKER_EXEC rm -rf build
+            CFLAGS="${CFLAGS} -fsanitize=address,undefined"
+            docker_exec mkdir build
+            docker_exec ${CC:-cc} --version
+            docker_exec make CFLAGS="${CFLAGS}" -C ./src -B OBJDIR=../build
+            docker_exec rm -rf build
             ;;
         CLEANUP)
             info "Cleanup phase"
diff --git a/travis-ci/managers/xenial.sh b/travis-ci/managers/xenial.sh
index c083e12..14f96c9 100755
--- a/travis-ci/managers/xenial.sh
+++ b/travis-ci/managers/xenial.sh
@@ -10,6 +10,8 @@ source "$(dirname $0)/travis_wait.bash"
 
 cd $REPO_ROOT
 
+CFLAGS="-g -O2 -Werror -Wall -fsanitize=address,undefined"
 mkdir build
-make CFLAGS='-Werror -Db_sanitize=address,undefined' -C ./src -B OBJDIR=../build
+cc --version
+make CFLAGS="${CFLAGS}" -C ./src -B OBJDIR=../build
 rm -rf build