diff --git a/set-sky-time.sh b/set-sky-time.sh
index f7f8c0a..0f0ae68 100755
--- a/set-sky-time.sh
+++ b/set-sky-time.sh
@@ -13,6 +13,6 @@ fi
 
 target_epoch=$(date -d "today $TARGET" +%s) || exit 2
 now_epoch=$(date +%s)
-offset_h=$(awk "BEGIN { printf \"%.4f\", ($target_epoch - $now_epoch) / 3600 }")
+offset_h=$(LC_ALL=C awk "BEGIN { printf \"%.4f\", ($target_epoch - $now_epoch) / 3600 }")
 printf '%s\n' "$offset_h" > "$STATE_FILE"
 printf 'Relógio do céu em %s de hoje (offset %sh)\n' "$TARGET" "$offset_h"