diff --git a/esphome/components/api/proto.cpp b/esphome/components/api/proto.cpp
index e35565dd6d..8959ac7a2a 100644
--- a/esphome/components/api/proto.cpp
+++ b/esphome/components/api/proto.cpp
@@ -69,7 +69,7 @@ uint32_t ProtoDecodableMessage::count_repeated_field(const uint8_t *buffer, size
       break;  // Invalid data, stop counting
     }
 
-    uint32_t tag = res.value;
+    uint32_t tag = static_cast<uint32_t>(res.value);
     uint32_t field_type = tag & WIRE_TYPE_MASK;
     uint32_t field_id = tag >> 3;
     ptr += res.consumed;
@@ -94,7 +94,7 @@ uint32_t ProtoDecodableMessage::count_repeated_field(const uint8_t *buffer, size
         if (!res.has_value()) {
           return count;
         }
-        uint32_t field_length = res.value;
+        uint32_t field_length = static_cast<uint32_t>(res.value);
         ptr += res.consumed;
         if (field_length > static_cast<size_t>(end - ptr)) {
           return count;  // Out of bounds
@@ -215,7 +215,7 @@ void ProtoDecodableMessage::decode(const uint8_t *buffer, size_t length) {
       return;
     }
 
-    uint32_t tag = res.value;
+    uint32_t tag = static_cast<uint32_t>(res.value);
     uint32_t field_type = tag & WIRE_TYPE_MASK;
     uint32_t field_id = tag >> 3;
     ptr += res.consumed;
@@ -240,7 +240,7 @@ void ProtoDecodableMessage::decode(const uint8_t *buffer, size_t length) {
           ESP_LOGV(TAG, "Invalid Length Delimited at offset %ld", (long) (ptr - buffer));
           return;
         }
-        uint32_t field_length = res.value;
+        uint32_t field_length = static_cast<uint32_t>(res.value);
         ptr += res.consumed;
         if (field_length > static_cast<size_t>(end - ptr)) {
           ESP_LOGV(TAG, "Out-of-bounds Length Delimited at offset %ld", (long) (ptr - buffer));