diff --git a/.github/workflows/linux.yml b/.github/workflows/linux.yml
index 6ac646b3c..fe6d3752c 100644
--- a/.github/workflows/linux.yml
+++ b/.github/workflows/linux.yml
@@ -85,7 +85,7 @@ jobs:
 
           docker run --rm \
           -v $PWD:/usr/src/tdesktop \
-          -e DEBUG=1 \
+          -e CONFIG=Debug \
           tdesktop:centos_env \
           /usr/src/tdesktop/Telegram/build/docker/centos_env/build.sh \
           -D CMAKE_C_FLAGS_DEBUG="" \
diff --git a/Telegram/build/docker/centos_env/build.sh b/Telegram/build/docker/centos_env/build.sh
index 6aee294a4..0bf1aae04 100755
--- a/Telegram/build/docker/centos_env/build.sh
+++ b/Telegram/build/docker/centos_env/build.sh
@@ -3,9 +3,4 @@ set -e
 
 cd Telegram
 ./configure.sh "$@"
-
-if [ -n "$DEBUG" ]; then
-	cmake --build ../out --config Debug --parallel
-else
-	cmake --build ../out --config Release --parallel
-fi
+cmake --build ../out --config "${CONFIG:-RelWithDebInfo}" --parallel
diff --git a/docs/building-linux.md b/docs/building-linux.md
index 6be5a32b4..4fa4503b5 100644
--- a/docs/building-linux.md
+++ b/docs/building-linux.md
@@ -30,7 +30,7 @@ Or, to create a debug build, run (also using [your **api_id** and **api_hash**](
 
     docker run --rm -it \
         -v $PWD:/usr/src/tdesktop \
-        -e DEBUG=1 \
+        -e CONFIG=Debug \
         tdesktop:centos_env \
         /usr/src/tdesktop/Telegram/build/docker/centos_env/build.sh \
         -D TDESKTOP_API_ID=YOUR_API_ID \