diff --git a/esphome/components/mapping/mapping.h b/esphome/components/mapping/mapping.h
index 92138c4377c..2b8f0d39b2a 100644
--- a/esphome/components/mapping/mapping.h
+++ b/esphome/components/mapping/mapping.h
@@ -45,20 +45,16 @@ template<typename K, typename V> class Mapping {
     } else if constexpr (std::is_same_v<K, std::string>) {
       esph_log_e(TAG, "Key '%s' not found in mapping", key.c_str());
     } else if constexpr (std::is_integral_v<K>) {
-      char buf[24];  // enough for int64_t
-      buf_append_printf(buf, sizeof(buf), 0, "%" PRId64, static_cast<int64_t>(key));
-      esph_log_e(TAG, "Key '%s' not found in mapping", buf);
-    } else if constexpr (std::is_floating_point_v<K>) {
-      char buf[24];
-      buf_append_printf(buf, sizeof(buf), 0, "%g", static_cast<double>(key));
-      esph_log_e(TAG, "Key '%s' not found in mapping", buf);
-    } else if constexpr (std::is_enum_v<K>) {
-      char buf[24];  // enough for underlying integral type
-      buf_append_printf(buf, sizeof(buf), 0, "%" PRId64, static_cast<int64_t>(key));
+      char buf[24];  // enough for 64-bit integer
+      if constexpr (std::is_unsigned_v<K>) {
+        buf_append_printf(buf, sizeof(buf), 0, "%" PRIu64, static_cast<uint64_t>(key));
+      } else {
+        buf_append_printf(buf, sizeof(buf), 0, "%" PRId64, static_cast<int64_t>(key));
+      }
       esph_log_e(TAG, "Key '%s' not found in mapping", buf);
     } else {
-      // Fallback for custom types - likely unreachable but kept for compatibility
-      esph_log_e(TAG, "Key '%s' not found in mapping", to_string(key).c_str());
+      // All supported key types are handled above - this should never be reached
+      static_assert(sizeof(K) == 0, "Unsupported key type for Mapping error logging");
     }
     return {};
   }