diff --git a/tensilelite/Tensile/TensileCreateLibrary.py b/tensilelite/Tensile/TensileCreateLibrary.py
index 4e271a7d9..08e8719e4 100644
--- a/tensilelite/Tensile/TensileCreateLibrary.py
+++ b/tensilelite/Tensile/TensileCreateLibrary.py
@@ -205,7 +205,7 @@ def buildAssemblyCodeObjectFiles(kernels, kernelWriterAssembly, outputPath):
         coFileMap = collections.defaultdict(list)
 
         if len(objectFiles):
-          coFileMap[asmDir / "TensileLibrary_"+ gfx + extCoRaw] = objectFiles
+          coFileMap[asmDir / ("TensileLibrary_"+ gfx + extCoRaw)] = objectFiles
 
         for kernel in archKernels:
           coName = kernel.get("codeObjectFile", None)