diff --git a/MaterialLib/MPL/Properties/ParameterProperty.h b/MaterialLib/MPL/Properties/ParameterProperty.h
index 8e00afddf7f2dba779a7b3904f9e18b70a7d785e..d9c9fcbfe39136a72abc630b25929fbe059b6de7 100644
--- a/MaterialLib/MPL/Properties/ParameterProperty.h
+++ b/MaterialLib/MPL/Properties/ParameterProperty.h
@@ -24,7 +24,8 @@ class ParameterProperty final : public Property
 {
 public:
     /// This constructor accepts a Parameter.
-    ParameterProperty(ParameterLib::Parameter<double> const& parameter);
+    explicit ParameterProperty(
+        ParameterLib::Parameter<double> const& parameter);
 
     /// This method computes the value of a property depending linearly on
     /// the value of the given primary variable.