diff --git a/karapace/protobuf/option_element.py b/karapace/protobuf/option_element.py
index 9ff50fe8e..70622d5ef 100644
--- a/karapace/protobuf/option_element.py
+++ b/karapace/protobuf/option_element.py
@@ -31,10 +31,14 @@ def __init__(self, name: str, kind: Kind, value, is_parenthesized: bool = False)
         self.formattedName = f"({self.name})" if is_parenthesized else self.name
 
     def to_schema(self) -> str:
-        aline = None
+        aline = ""
         if self.kind == self.Kind.STRING:
             aline = f'{self.formattedName} = "{self.value}"'
-        elif self.kind in [self.Kind.BOOLEAN, self.Kind.NUMBER, self.Kind.ENUM]:
+        elif self.kind == self.Kind.BOOLEAN:
+            aline = f"{self.formattedName} = {str(self.value).lower()}"
+        elif self.kind == self.Kind.NUMBER:
+            aline = f"{self.formattedName} = {self.value}"
+        elif self.kind == self.Kind.ENUM:
             aline = f"{self.formattedName} = {self.value}"
         elif self.kind == self.Kind.OPTION:
             aline = f"{self.formattedName}.{try_to_schema(self.value)}"
@@ -42,6 +46,8 @@ def to_schema(self) -> str:
             aline = [f"{self.formattedName} = {{\n", self.format_option_map(self.value), "}"]
         elif self.kind == self.Kind.LIST:
             aline = [f"{self.formattedName} = ", self.append_options(self.value)]
+        else:
+            raise ValueError("Unknown value Kind.")
 
         if isinstance(aline, list):
             return "".join(aline)
diff --git a/tests/unit/test_protobuf_binary_serialization.py b/tests/unit/test_protobuf_binary_serialization.py
index 06d1def96..6950066d3 100644
--- a/tests/unit/test_protobuf_binary_serialization.py
+++ b/tests/unit/test_protobuf_binary_serialization.py
@@ -51,11 +51,36 @@
     "CgdkZWZhdWx0Ig8KA0tleRIICgJpZBgBKAUiLQoDRG9nEgoKBG5hbWUYASgJEgwKBndlaWdodBgCKAUSDAoEdG95cxgEIAMoCWIGcHJvdG8z"
 )
 
+schema_serialized2 = (
+    "CiZwcm90by90ZWNoL2Rvam8vZHNwL3YxL2V2ZW50X2tleS5wcm90bxIQdGVjaC5kb2pvLmRzcC52MSIaCghFdmVudEtleRIOCgJpZBgBIAEoCVI"
+    + "CaWRCiAEKFGNvbS50ZWNoLmRvam8uZHNwLnYxQg1FdmVudEtleVByb3RvUAGiAgNURESqAhBUZWNoLkRvam8uRHNwLlYxygIQVGVjaFxEb2pvXER"
+    + "zcFxWMeICHFRlY2hcRG9qb1xEc3BcVjFcR1BCTWV0YWRhdGHqAhNUZWNoOjpEb2pvOjpEc3A6OlYxYgZwcm90bzM="
+)
+
+schema_plain2 = """\
+syntax = "proto3";
+package tech.dojo.dsp.v1;
+
+option java_package = "com.tech.dojo.dsp.v1";
+option java_outer_classname = "EventKeyProto";
+option java_multiple_files = true;
+option objc_class_prefix = "TDD";
+option csharp_namespace = "Tech.Dojo.Dsp.V1";
+option php_namespace = "Tech\\\\Dojo\\\\Dsp\\\\V1";
+option php_metadata_namespace = "Tech\\\\Dojo\\\\Dsp\\\\V1\\\\GPBMetadata";
+option ruby_package = "Tech::Dojo::Dsp::V1";
+
+message EventKey {
+  string id = 1;
+}
+"""
+
 
 @pytest.mark.parametrize(
     "schema_plain,schema_serialized",
     [
         (schema_plain1, schema_serialized1),
+        (schema_plain2, schema_serialized2),
         (schema_protobuf_plain, schema_protobuf_plain_bin),
         (schema_protobuf_order_after, schema_protobuf_order_after_bin),
         (schema_protobuf_nested_message4, schema_protobuf_nested_message4_bin),