diff --git a/lib/Dialect/QCS/Utils/ParameterInitialValueAnalysis.cpp b/lib/Dialect/QCS/Utils/ParameterInitialValueAnalysis.cpp
index 321696152..62b064905 100644
--- a/lib/Dialect/QCS/Utils/ParameterInitialValueAnalysis.cpp
+++ b/lib/Dialect/QCS/Utils/ParameterInitialValueAnalysis.cpp
@@ -63,7 +63,7 @@ ParameterInitialValueAnalysis::ParameterInitialValueAnalysis(
           if (!parameterLoadOp)
             continue;
 
-          double initialValue =
+          const double initialValue =
               std::get<double>(parameterLoadOp.getInitialValue());
           initialValues_[parameterLoadOp.getParameterName()] = initialValue;
           foundParameters = true;