diff --git a/invokeai/app/invocations/params.py b/invokeai/app/invocations/params.py
index 1a03baa7cc..513eb8762f 100644
--- a/invokeai/app/invocations/params.py
+++ b/invokeai/app/invocations/params.py
@@ -6,8 +6,7 @@ from pydantic import Field
 
 from invokeai.app.invocations.prompt import PromptOutput
 
-from .baseinvocation import (BaseInvocation, BaseInvocationOutput,
-                             InvocationConfig, InvocationContext)
+from .baseinvocation import BaseInvocation, BaseInvocationOutput, InvocationConfig, InvocationContext
 from .math import FloatOutput, IntOutput
 
 # Pass-through parameter nodes - used by subgraphs
@@ -68,6 +67,7 @@ class ParamStringInvocation(BaseInvocation):
     def invoke(self, context: InvocationContext) -> StringOutput:
         return StringOutput(text=self.text)
 
+
 class ParamPromptInvocation(BaseInvocation):
     """A prompt input parameter"""
 
@@ -80,4 +80,4 @@ class ParamPromptInvocation(BaseInvocation):
         }
 
     def invoke(self, context: InvocationContext) -> PromptOutput:
-        return PromptOutput(prompt=self.prompt)
\ No newline at end of file
+        return PromptOutput(prompt=self.prompt)