diff --git a/dumux/material/components/heavyoil.hh b/dumux/material/components/heavyoil.hh
index 80f2549a4d1bcd4a624c5e644a3eae703ebf4af1..fa5067830cf0342b4bcc69c1a36c3cb70b4b3479 100644
--- a/dumux/material/components/heavyoil.hh
+++ b/dumux/material/components/heavyoil.hh
@@ -401,9 +401,8 @@ public:
      *
      * \param temperature temperature of component in \f$\mathrm{[K]}\f$
      * \param pressure pressure of component in \f$\mathrm{[Pa]}\f$
-     * \param regularize defines, if the functions is regularized or not, set to true by default
      */
-    static Scalar gasViscosity(Scalar temperature, Scalar pressure, bool regularize=true)
+    static Scalar gasViscosity(Scalar temperature, Scalar pressure)
     {
         using std::clamp;
         temperature = clamp(temperature, 250.0, 500.0); // regularization
diff --git a/dumux/material/components/mesitylene.hh b/dumux/material/components/mesitylene.hh
index 5d15020401c3ef339a7dbdcfda4b53d1d6a19408..20e15b2edc718ca674cbc5305782eac789949d9e 100644
--- a/dumux/material/components/mesitylene.hh
+++ b/dumux/material/components/mesitylene.hh
@@ -278,9 +278,8 @@ public:
      *
      * \param temperature temperature of component in \f$\mathrm{[K]}\f$
      * \param pressure pressure of component in \f$\mathrm{[Pa]}\f$
-     * \param regularize defines, if the functions is regularized or not, set to true by default
      */
-    static Scalar gasViscosity(Scalar temperature, Scalar pressure, bool regularize=true)
+    static Scalar gasViscosity(Scalar temperature, Scalar pressure)
     {
         using std::min;
         using std::max;
diff --git a/dumux/material/components/simpleh2o.hh b/dumux/material/components/simpleh2o.hh
index 97a1e6c1a30e3aa9da0fae10046cf23ae071ad9b..57a4ff0bbfed75d6d9c2d2fa089d21c234c44508 100644
--- a/dumux/material/components/simpleh2o.hh
+++ b/dumux/material/components/simpleh2o.hh
@@ -289,9 +289,8 @@ public:
      *
      * \param temperature temperature of component in \f$\mathrm{[K]}\f$
      * \param pressure pressure of component in \f$\mathrm{[Pa]}\f$
-     * \param regularize defines, if the functions is regularized or not, set to true by default
      */
-    static Scalar gasViscosity(Scalar temperature, Scalar pressure, bool regularize=true)
+    static Scalar gasViscosity(Scalar temperature, Scalar pressure)
     {
         return 1e-05;
     }
diff --git a/dumux/material/components/xylene.hh b/dumux/material/components/xylene.hh
index f6c0e71e8711b8c788c904f9cb4703c56371594b..bf7869ef7ae446e42a6657b8ba4cbeaae747fdf7 100644
--- a/dumux/material/components/xylene.hh
+++ b/dumux/material/components/xylene.hh
@@ -324,9 +324,8 @@ public:
      *
      * \param temp temperature of component in \f$\mathrm{[K]}\f$
      * \param pressure pressure of component in \f$\mathrm{[Pa]}\f$
-     * \param regularize defines, if the functions is regularized or not, set to true by default
      */
-    static Scalar gasViscosity(Scalar temp, Scalar pressure, bool regularize=true)
+    static Scalar gasViscosity(Scalar temp, Scalar pressure)
     {
         using std::min;
         using std::max;