diff --git a/dist/tools/pr_check/pr_check.sh b/dist/tools/pr_check/pr_check.sh
index 69927d7da6..2a30b3c55b 100755
--- a/dist/tools/pr_check/pr_check.sh
+++ b/dist/tools/pr_check/pr_check.sh
@@ -50,4 +50,10 @@ if [ -n "$TRAVIS_PULL_REQUEST" -o -n "$CI_PULL_NR" ]; then
     fi
 fi
 
+if git grep -q PKG_SOURCE_LOCAL -- pkg/*/Makefile; then
+    echo -e "${CERROR}The following files contain a PKG_SOURCE_LOCAL definition:${CRESET}"
+    git grep -l PKG_SOURCE_LOCAL -- pkg/*/Makefile
+    EXIT_CODE=1
+fi
+
 exit ${EXIT_CODE}