diff --git a/PowerGrid/MPI/PowerGridPcSenseMPI_TS.cpp b/PowerGrid/MPI/PowerGridPcSenseMPI_TS.cpp
index 62f063a..d26b64c 100755
--- a/PowerGrid/MPI/PowerGridPcSenseMPI_TS.cpp
+++ b/PowerGrid/MPI/PowerGridPcSenseMPI_TS.cpp
@@ -59,8 +59,8 @@ int main(int argc, char** argv)
 		("Ny,y", po::value<uword>(&Ny), "Image size in Y")
 		("Nz,z", po::value<uword>(&Nz), "Image size in Z")
         ("NShots,s", po::value<uword>(&NShots), "Number of shots per image")
-        ("TimeSegmentationInterp,I", po::value<std::string>(&TimeSegmentationInterp)->required(), "Field Correction Interpolator (Required)")
-        ("TimeSegments,t", po::value<uword>(&L)->required(), "Number of time segments (Required)")
+        ("TimeSegmentationInterp,I", po::value<std::string>(&TimeSegmentationInterp), "Field Correction Interpolator (Required)")
+        ("TimeSegments,t", po::value<uword>(&L), "Number of time segments (Required)")
         ("Beta,B", po::value<double>(&beta), "Spatial regularization penalty weight")("Dims2Penalize,D", po::value<uword>(&dims2penalize), "Dimensions to apply regularization to (2 or 3)")
         ("CGIterations,n", po::value<uword>(&NIter), "Number of preconditioned conjugate gradient interations for main solver");
 
diff --git a/PowerGrid/PowerGridIsmrmrd.cpp b/PowerGrid/PowerGridIsmrmrd.cpp
index 56f1f44..dc18aee 100755
--- a/PowerGrid/PowerGridIsmrmrd.cpp
+++ b/PowerGrid/PowerGridIsmrmrd.cpp
@@ -53,9 +53,9 @@ int main(int argc, char **argv) {
 			("Ny,y", po::value<uword>(&Ny), "Image size in Y")
 			("Nz,z", po::value<uword>(&Nz), "Image size in Z")
           ("NShots,s", po::value<uword>(&NShots), "Number of shots per image")
-          ("TimeSegmentationInterp,I", po::value<std::string>(&TimeSegmentationInterp)->required(), "Field Correction Interpolator (Required)")
+          ("TimeSegmentationInterp,I", po::value<std::string>(&TimeSegmentationInterp), "Field Correction Interpolator")
           ("FourierTransform,F", po::value<std::string>(&FourierTrans)->required(), "Implementation of Fourier Transform")
-          ("TimeSegments,t", po::value<uword>(&L)->required(), "Number of time segments (Required)")
+          ("TimeSegments,t", po::value<uword>(&L), "Number of time segments")
           ("Beta,B", po::value<double>(&beta), "Spatial regularization penalty weight")
           ("CGIterations,n", po::value<uword>(&NIter), "Number of preconditioned conjugate gradient interations for main solver")
           ("Dims2Penalize,D", po::value<uword>(&dims2penalize), "Dimensions to apply regularization to (2 or 3).");
diff --git a/PowerGrid/PowerGridPcSenseTimeSeg.cpp b/PowerGrid/PowerGridPcSenseTimeSeg.cpp
index 0d030eb..f5904cc 100644
--- a/PowerGrid/PowerGridPcSenseTimeSeg.cpp
+++ b/PowerGrid/PowerGridPcSenseTimeSeg.cpp
@@ -55,8 +55,8 @@ int main(int argc, char **argv)
 			("Nx,x", po::value<uword>(&Nx), "Image size in X")
 			("Ny,y", po::value<uword>(&Ny), "Image size in Y")
 			("Nz,z", po::value<uword>(&Nz), "Image size in Z")
-            ("TimeSegmentationInterp,I", po::value<std::string>(&TimeSegmentationInterp)->required(), "Field Correction Interpolator (Required)")
-            ("TimeSegments,t", po::value<uword>(&L)->required(), "Number of time segments (Required)")
+            ("TimeSegmentationInterp,I", po::value<std::string>(&TimeSegmentationInterp), "Field Correction Interpolator")
+            ("TimeSegments,t", po::value<uword>(&L), "Number of time segments")
 			("NShots,s", po::value<uword>(&NShots), "Number of shots per image")
 			("Beta,B", po::value<double>(&beta), "Spatial regularization penalty weight")
 			("Dims2Penalize,D", po::value<uword>(&dims2penalize), "Dimensions to apply regularization to (2 or 3)")