diff --git a/esphome/components/api/api_pb2_dump.cpp b/esphome/components/api/api_pb2_dump.cpp
index f9f45ad071..c47d95ed5d 100644
--- a/esphome/components/api/api_pb2_dump.cpp
+++ b/esphome/components/api/api_pb2_dump.cpp
@@ -913,9 +913,9 @@ void ListEntitiesLightResponse::dump_to(std::string &out) const {
   dump_field(out, "object_id", this->object_id_ref_);
   dump_field(out, "key", this->key);
   dump_field(out, "name", this->name_ref_);
-  out.append("  supported_color_modes: 0x");
-  out.append(uint32_to_string(this->supported_color_modes));
-  out.append("\n");
+  char buffer[32];
+  snprintf(buffer, sizeof(buffer), "  supported_color_modes: 0x%08" PRIX32 "\n", this->supported_color_modes);
+  out.append(buffer);
   dump_field(out, "min_mireds", this->min_mireds);
   dump_field(out, "max_mireds", this->max_mireds);
   for (const auto &it : this->effects) {
diff --git a/script/api_protobuf/api_protobuf.py b/script/api_protobuf/api_protobuf.py
index 9e140ca9ce..8a841354a9 100755
--- a/script/api_protobuf/api_protobuf.py
+++ b/script/api_protobuf/api_protobuf.py
@@ -1564,9 +1564,9 @@ class RepeatedTypeInfo(TypeInfo):
         if self._use_bitmask:
             # For bitmask fields, dump the hex value of the bitmask
             return (
-                f'out.append("  {self.field_name}: 0x");\n'
-                f"out.append(uint32_to_string(this->{self.field_name}));\n"
-                f'out.append("\\n");'
+                f"char buffer[32];\n"
+                f'snprintf(buffer, sizeof(buffer), "  {self.field_name}: 0x%08" PRIX32 "\\n", this->{self.field_name});\n'
+                f"out.append(buffer);"
             )
         if self._use_pointer:
             # For pointer fields, dereference and use the existing helper