diff --git a/esphome/components/logger/logger.h b/esphome/components/logger/logger.h
index a1f3df97dd..f0e0ed9a27 100644
--- a/esphome/components/logger/logger.h
+++ b/esphome/components/logger/logger.h
@@ -355,6 +355,12 @@ class Logger : public Component {
     buffer[pos++] = '[';
     copy_string(buffer, pos, tag);
     buffer[pos++] = ':';
+    // Format line number without modulo operations (passed by value, safe to mutate)
+    if (line > 999) [[unlikely]] {
+      int thousands = line / 1000;
+      buffer[pos++] = '0' + thousands;
+      line -= thousands * 1000;
+    }
     int hundreds = line / 100;
     int remainder = line - hundreds * 100;
     int tens = remainder / 10;