diff --git a/esphome/components/modbus/modbus.cpp b/esphome/components/modbus/modbus.cpp
index ccfa589b90..a80ac546ef 100644
--- a/esphome/components/modbus/modbus.cpp
+++ b/esphome/components/modbus/modbus.cpp
@@ -19,28 +19,24 @@ void Modbus::setup() {
 void Modbus::loop() {
   const uint32_t now = App.get_loop_component_start_time();
 
-  // Early return avoids stack adjustment for the batch buffer below.
-  // loop() runs ~7000/min so most calls have nothing to read.
+  // Read all available bytes in batches to reduce UART call overhead.
   int avail = this->available();
-  if (avail > 0) {
-    // Read all available bytes in batches to reduce UART call overhead.
-    uint8_t buf[64];
-    while (avail > 0) {
-      size_t to_read = std::min(static_cast<size_t>(avail), sizeof(buf));
-      if (!this->read_array(buf, to_read)) {
-        break;
-      }
-      avail -= to_read;
+  uint8_t buf[64];
+  while (avail > 0) {
+    size_t to_read = std::min(static_cast<size_t>(avail), sizeof(buf));
+    if (!this->read_array(buf, to_read)) {
+      break;
+    }
+    avail -= to_read;
 
-      for (size_t i = 0; i < to_read; i++) {
-        if (this->parse_modbus_byte_(buf[i])) {
-          this->last_modbus_byte_ = now;
-        } else {
-          size_t at = this->rx_buffer_.size();
-          if (at > 0) {
-            ESP_LOGV(TAG, "Clearing buffer of %d bytes - parse failed", at);
-            this->rx_buffer_.clear();
-          }
+    for (size_t i = 0; i < to_read; i++) {
+      if (this->parse_modbus_byte_(buf[i])) {
+        this->last_modbus_byte_ = now;
+      } else {
+        size_t at = this->rx_buffer_.size();
+        if (at > 0) {
+          ESP_LOGV(TAG, "Clearing buffer of %d bytes - parse failed", at);
+          this->rx_buffer_.clear();
         }
       }
     }