diff --git a/dev-scripts/_common.sh b/dev-scripts/_common.sh
index eb75b46..e104fd6 100755
--- a/dev-scripts/_common.sh
+++ b/dev-scripts/_common.sh
@@ -29,7 +29,7 @@ load_env() {
   # Export only lines that are KEY=VALUE (skip comments and blanks)
   set -o allexport
   # shellcheck disable=SC1090
-  source <(grep -E '^[A-Z_]+=.+' "$env_file")
+  source <(grep -E '^[A-Z_][A-Z0-9_]*=.+' "$env_file")
   set +o allexport
 }