diff --git a/avro/compatibility.py b/avro/compatibility.py
index 0ce084a..670fcb2 100644
--- a/avro/compatibility.py
+++ b/avro/compatibility.py
@@ -50,6 +50,9 @@ class SchemaType(str, Enum):
     STRING = "string"
     UNION = "union"
 
+    def __str__(self):
+        return self.value
+
 
 class SchemaCompatibilityType(Enum):
     compatible = "compatible"