diff --git a/script/api_protobuf/api_protobuf.py b/script/api_protobuf/api_protobuf.py
index 0cfa7fc344..96471d33b2 100755
--- a/script/api_protobuf/api_protobuf.py
+++ b/script/api_protobuf/api_protobuf.py
@@ -657,20 +657,23 @@ class BytesType(TypeInfo):
         return f"buffer.encode_bytes({self.number}, this->{self.field_name}_ptr_, this->{self.field_name}_len_);"
 
     def dump(self, name: str) -> str:
+        ptr_dump = f"format_hex_pretty(this->{self.field_name}_ptr_, this->{self.field_name}_len_)"
+        str_dump = f"format_hex_pretty(reinterpret_cast<const uint8_t*>(this->{self.field_name}.data()), this->{self.field_name}.size())"
+
         # For SOURCE_CLIENT only, always use std::string
         if not self.needs_encode:
-            return f"out.append(format_hex_pretty(reinterpret_cast<const uint8_t*>(this->{self.field_name}.data()), this->{self.field_name}.size()));"
+            return f"out.append({str_dump});"
 
         # For SOURCE_SERVER, always use pointer/length
         if not self.needs_decode:
-            return f"out.append(format_hex_pretty(this->{self.field_name}_ptr_, this->{self.field_name}_len_));"
+            return f"out.append({ptr_dump});"
 
         # For SOURCE_BOTH, check if pointer is set (sending) or use string (received)
         return (
             f"if (this->{self.field_name}_ptr_ != nullptr) {{\n"
-            f"    out.append(format_hex_pretty(this->{self.field_name}_ptr_, this->{self.field_name}_len_));\n"
+            f"    out.append({ptr_dump});\n"
             f"  }} else {{\n"
-            f"    out.append(format_hex_pretty(reinterpret_cast<const uint8_t*>(this->{self.field_name}.data()), this->{self.field_name}.size()));\n"
+            f"    out.append({str_dump});\n"
             f"  }}"
         )