diff --git a/esphome/core/gpio.cpp b/esphome/core/gpio.cpp
index d8353ab64c..bce233c566 100644
--- a/esphome/core/gpio.cpp
+++ b/esphome/core/gpio.cpp
@@ -1,14 +1,18 @@
 #include "esphome/core/gpio.h"
 #include "esphome/core/log.h"
 
+#include <algorithm>
+
 namespace esphome {
 
 void log_pin(const char *tag, const char *prefix, GPIOPin *pin) {
   if (pin == nullptr)
     return;
   char buffer[GPIO_SUMMARY_MAX_LEN];
-  pin->dump_summary(buffer, sizeof(buffer));
-  esp_log_printf_(ESPHOME_LOG_LEVEL_CONFIG, tag, __LINE__, "%s%s", prefix, buffer);
+  size_t len = pin->dump_summary(buffer, sizeof(buffer));
+  // Clamp to actual buffer size (snprintf returns would-be length)
+  len = std::min(len, sizeof(buffer) - 1);
+  esp_log_printf_(ESPHOME_LOG_LEVEL_CONFIG, tag, __LINE__, "%s%.*s", prefix, (int) len, buffer);
 }
 
 }  // namespace esphome