diff --git a/tools/check/check_code_quality.sh b/tools/check/check_code_quality.sh
index af09dce9d4..e40d3635e8 100755
--- a/tools/check/check_code_quality.sh
+++ b/tools/check/check_code_quality.sh
@@ -84,6 +84,18 @@ ${searchForbiddenStringsScript} ./tools/check/forbidden_strings_in_code_sdk.txt
 
 resultForbiddenStringInCodeSdk=$?
 
+echo
+echo "Search for forbidden patterns specific for App code..."
+
+${searchForbiddenStringsScript} ./tools/check/forbidden_strings_in_code_app.txt \
+    ./vector/src/main/java \
+    ./vector/src/debug/java \
+    ./vector/src/release/java \
+    ./vector/src/fdroid/java \
+    ./vector/src/gplay/java
+
+resultForbiddenStringInCodeApp=$?
+
 echo
 echo "Search for forbidden patterns in resources..."
 
@@ -167,6 +179,7 @@ echo
 if [[ ${resultNbOfDrawable} -eq 0 ]] \
    && [[ ${resultForbiddenStringInCode} -eq 0 ]] \
    && [[ ${resultForbiddenStringInCodeSdk} -eq 0 ]] \
+   && [[ ${resultForbiddenStringInCodeApp} -eq 0 ]] \
    && [[ ${resultForbiddenStringInResource} -eq 0 ]] \
    && [[ ${resultForbiddenStringInLayout} -eq 0 ]] \
    && [[ ${resultLongFiles} -eq 0 ]] \
diff --git a/tools/check/forbidden_strings_in_code_app.txt b/tools/check/forbidden_strings_in_code_app.txt
new file mode 100644
index 0000000000..2a74d321af
--- /dev/null
+++ b/tools/check/forbidden_strings_in_code_app.txt
@@ -0,0 +1,18 @@
+#
+# Copyright 2022 New Vector Ltd
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+### You should not use code from internal SDK package. Either move them to the API package, or add a proper API to access this code, and add internal keyword SDK side.
+import org.matrix.android.sdk.internal