diff --git a/setup.sh b/setup.sh
index 06af0c2..ca9dc9b 100755
--- a/setup.sh
+++ b/setup.sh
@@ -7,6 +7,9 @@
 # Usage: ./setup.sh [--model <ollama-tag>] [--gpu|--no-gpu] [--port <n>] [--yes]
 set -euo pipefail
 cd "$(dirname "$0")"
+# Numeric formatting/parsing below assumes '.' as the decimal point (awk, sort -n).
+# A locale like de_DE (comma decimal separator) would corrupt those comparisons.
+export LC_ALL=C
 
 FORCE_MODEL=""; FORCE_GPU=""; ASSUME_YES=0; FORCE_PORT=""
 while [ $# -gt 0 ]; do