diff --git a/lib/Conversion/SCFToCalyx/SCFToCalyx.cpp b/lib/Conversion/SCFToCalyx/SCFToCalyx.cpp
index c5b30383899d..cb35aa8984fa 100644
--- a/lib/Conversion/SCFToCalyx/SCFToCalyx.cpp
+++ b/lib/Conversion/SCFToCalyx/SCFToCalyx.cpp
@@ -335,7 +335,7 @@ class BuildOpGroups : public calyx::FuncOpPartialLoweringPattern {
           return failure();
         }
         llvm::raw_os_ostream llvmOut(outFile);
-        llvm::json::OStream jsonOS(llvmOut, 2);
+        llvm::json::OStream jsonOS(llvmOut, /*IndentSize=*/2);
         jsonOS.value(getState<ComponentLoweringState>().getExtMemData());
         jsonOS.flush();
         outFile.close();