diff --git a/llvm/utils/spirv-sim/instructions.py b/llvm/utils/spirv-sim/instructions.py
index 5ae0f826648ee4e..c1e3d1e1ef7ab07 100644
--- a/llvm/utils/spirv-sim/instructions.py
+++ b/llvm/utils/spirv-sim/instructions.py
@@ -1,5 +1,6 @@
 from typing import Optional
 
+
 # Base class for an instruction. To implement a basic instruction that doesn't
 # impact the control-flow, create a new class inheriting from this.
 class Instruction:
@@ -256,14 +257,16 @@ def _impl(self, module, lane):
             output.append(lane.get_register(op))
         lane.set_register(self._result, output)
 
+
 class OpCompositeExtract(Instruction):
     def _impl(self, module, lane):
         value = lane.get_register(self._operands[1])
         output = value
         for op in self._operands[2:]:
-          output = output[int(op)]
+            output = output[int(op)]
         lane.set_register(self._result, output)
 
+
 class OpStore(Instruction):
     def _impl(self, module, lane):
         lane.set_register(self._operands[0], lane.get_register(self._operands[1]))