diff --git a/src/Mod/Fem/App/FemPostFilterPyImp.cpp b/src/Mod/Fem/App/FemPostFilterPyImp.cpp
index e8f91f63ca..af92e49375 100644
--- a/src/Mod/Fem/App/FemPostFilterPyImp.cpp
+++ b/src/Mod/Fem/App/FemPostFilterPyImp.cpp
@@ -50,7 +50,7 @@ std::string FemPostFilterPy::representation() const
 }
 
 
-PyObject* FemPostFilterPy::addFilterPipeline(PyObject* args)
+PyObject* FemPostFilterPy::addFilterPipeline([[maybe_unused]] PyObject* args)
 {
 #ifdef FC_USE_VTK_PYTHON
     const char* name;
@@ -84,7 +84,6 @@ PyObject* FemPostFilterPy::addFilterPipeline(PyObject* args)
 
     Py_Return;
 #else
-    (void)args;
     PyErr_SetString(PyExc_NotImplementedError, "VTK python wrapper not available");
     return nullptr;
 #endif
@@ -117,7 +116,7 @@ PyObject* FemPostFilterPy::getParentPostGroup(PyObject* args)
     Py_Return;
 }
 
-PyObject* FemPostFilterPy::getInputData(PyObject* args)
+PyObject* FemPostFilterPy::getInputData([[maybe_unused]] PyObject* args)
 {
 #ifdef FC_USE_VTK_PYTHON
     // we take no arguments
@@ -146,7 +145,6 @@ PyObject* FemPostFilterPy::getInputData(PyObject* args)
 
     return py_dataset;
 #else
-    (void)args;
     PyErr_SetString(PyExc_NotImplementedError, "VTK python wrapper not available");
     return nullptr;
 #endif
@@ -189,7 +187,7 @@ PyObject* FemPostFilterPy::getInputScalarFields(PyObject* args)
     return Py::new_reference_to(list);
 }
 
-PyObject* FemPostFilterPy::getOutputAlgorithm(PyObject* args)
+PyObject* FemPostFilterPy::getOutputAlgorithm([[maybe_unused]] PyObject* args)
 {
 #ifdef FC_USE_VTK_PYTHON
     // we take no arguments
@@ -203,7 +201,6 @@ PyObject* FemPostFilterPy::getOutputAlgorithm(PyObject* args)
 
     return py_algorithm;
 #else
-    (void)args;
     PyErr_SetString(PyExc_NotImplementedError, "VTK python wrapper not available");
     return nullptr;
 #endif
diff --git a/src/Mod/Fem/App/FemPostObjectPyImp.cpp b/src/Mod/Fem/App/FemPostObjectPyImp.cpp
index 394a94c272..a573814639 100644
--- a/src/Mod/Fem/App/FemPostObjectPyImp.cpp
+++ b/src/Mod/Fem/App/FemPostObjectPyImp.cpp
@@ -23,7 +23,6 @@
 
 #include <Python.h>
 
-
 #include "FemPostObjectPy.h"
 #include "FemPostObjectPy.cpp"
 
@@ -57,7 +56,7 @@ PyObject* FemPostObjectPy::writeVTK(PyObject* args)
     Py_Return;
 }
 
-PyObject* FemPostObjectPy::getDataSet(PyObject* args)
+PyObject* FemPostObjectPy::getDataSet([[maybe_unused]] PyObject* args)
 {
 #ifdef FC_USE_VTK_PYTHON
     // we take no arguments
@@ -74,7 +73,6 @@ PyObject* FemPostObjectPy::getDataSet(PyObject* args)
 
     Py_Return;
 #else
-    (void)args;
     PyErr_SetString(PyExc_NotImplementedError, "VTK python wrapper not available");
     return nullptr;
 #endif
diff --git a/src/Mod/Fem/App/FemPostPipelinePyImp.cpp b/src/Mod/Fem/App/FemPostPipelinePyImp.cpp
index ede97fa670..33feeb5c1b 100644
--- a/src/Mod/Fem/App/FemPostPipelinePyImp.cpp
+++ b/src/Mod/Fem/App/FemPostPipelinePyImp.cpp
@@ -22,15 +22,12 @@
 
 #include <Python.h>
 
-
 #include <Base/FileInfo.h>
 #include <Base/UnitPy.h>
 
-// clang-format off
 #include "FemPostPipeline.h"
 #include "FemPostPipelinePy.h"
 #include "FemPostPipelinePy.cpp"
-// clang-format on
 
 #ifdef FC_USE_VTK_PYTHON
 # include <vtkPythonUtil.h>
@@ -304,7 +301,7 @@ PyObject* FemPostPipelinePy::renameArrays(PyObject* args)
     Py_Return;
 }
 
-PyObject* FemPostPipelinePy::getOutputAlgorithm(PyObject* args)
+PyObject* FemPostPipelinePy::getOutputAlgorithm([[maybe_unused]] PyObject* args)
 {
 #ifdef FC_USE_VTK_PYTHON
     // we take no arguments
@@ -318,7 +315,6 @@ PyObject* FemPostPipelinePy::getOutputAlgorithm(PyObject* args)
 
     return py_algorithm;
 #else
-    (void)args;
     PyErr_SetString(PyExc_NotImplementedError, "VTK python wrapper not available");
     return nullptr;
 #endif
diff --git a/src/Mod/Fem/App/FemVTKTools.cpp b/src/Mod/Fem/App/FemVTKTools.cpp
index 79dd68270a..61f9311814 100644
--- a/src/Mod/Fem/App/FemVTKTools.cpp
+++ b/src/Mod/Fem/App/FemVTKTools.cpp
@@ -1421,18 +1421,12 @@ std::vector<int> readElements(
 }
 
 // read parameter header (not used)
-void readParameter(std::ifstream& ifstr, const std::string& line)
-{
-    // do nothing
-    (void)ifstr;
-    (void)line;
-}
+void readParameter([[maybe_unused]] std::ifstream& ifstr, [[maybe_unused]] const std::string& line)
+{}
 
 // read first header from nodal result block
-void readResultInfo(std::ifstream& ifstr, const std::string& lines, FRDResultInfo& info)
+void readResultInfo([[maybe_unused]] std::ifstream& ifstr, const std::string& lines, FRDResultInfo& info)
 {
-    (void)ifstr;
-
     std::string keyCode = "  100C";
 
     std::string_view view {lines};
@@ -1459,14 +1453,13 @@ void readResultInfo(std::ifstream& ifstr, const std::string& lines, FRDResultInf
 // read result from nodal result block and add result array to grid
 void readResults(
     std::ifstream& ifstr,
-    const std::string& lines,
+    [[maybe_unused]] const std::string& lines,
     const std::map<int, int>& mapNodes,
     const FRDResultInfo& info,
     vtkSmartPointer<vtkUnstructuredGrid>& grid
 )
 {
     int digits = getDigits(info.indicator);
-    (void)lines;
 
     // get dataset info, start with " -4"
     std::string line;
diff --git a/src/Mod/Fem/App/PropertyPostDataObject.cpp b/src/Mod/Fem/App/PropertyPostDataObject.cpp
index df098cddfc..7a001d5714 100644
--- a/src/Mod/Fem/App/PropertyPostDataObject.cpp
+++ b/src/Mod/Fem/App/PropertyPostDataObject.cpp
@@ -185,7 +185,7 @@ PyObject* PropertyPostDataObject::getPyObject()
 #endif
 }
 
-void PropertyPostDataObject::setPyObject(PyObject* value)
+void PropertyPostDataObject::setPyObject([[maybe_unused]] PyObject* value)
 {
 #ifdef FC_USE_VTK_PYTHON
     vtkObjectBase* obj = vtkPythonUtil::GetPointerFromObject(value, "vtkDataObject");