diff --git a/src/V3_1_NginxConfigDeclaration.py b/src/V3_1_NginxConfigDeclaration.py
index fa724ff..393527c 100644
--- a/src/V3_1_NginxConfigDeclaration.py
+++ b/src/V3_1_NginxConfigDeclaration.py
@@ -146,7 +146,7 @@ def check_type(self) -> 'Output':
         if isError:
             raise ValueError("Invalid output data for type '" + _type + "'")
 
-        return selfsmartmontools
+        return self
 
 
 class OcspStapling(BaseModel, extra="forbid"):
@@ -442,4 +442,4 @@ class APIGateway(BaseModel, extra="forbid"):
 
 class ConfigDeclaration(BaseModel, extra="forbid"):
     output: Output
-    declaration: Optional[Declaration] = {}
\ No newline at end of file
+    declaration: Optional[Declaration] = {}