diff --git a/CHT/flow-over-plate/buoyantPimpleFoam-fenics/Solid/heat.py b/CHT/flow-over-plate/buoyantPimpleFoam-fenics/Solid/heat.py
index 57c44b15e..6eed16305 100644
--- a/CHT/flow-over-plate/buoyantPimpleFoam-fenics/Solid/heat.py
+++ b/CHT/flow-over-plate/buoyantPimpleFoam-fenics/Solid/heat.py
@@ -178,17 +178,17 @@ def determine_heat_flux(V_g, u, k, flux):
         n = n_cp
     else:  # update solution
         u_n.assign(u_np1)
-        t += dt
+        t += float(dt)
         n += 1
 
     if precice.is_time_window_complete():
         tol = 10e-5  # we need some tolerance, since otherwise output might be skipped.
-        if abs((float(t)+tol) % dt_out) < 2*tol:  # output if t is a multiple of dt_out
+        if abs((t + tol) % dt_out) < 2*tol:  # output if t is a multiple of dt_out
             print("output vtk for time = {}".format(float(t)))
             file_out << u_n
 
     # Update dirichlet BC
-    u_D.t = t + dt(0)
+    u_D.t = t + float(dt)
 
 # Hold plot
 precice.finalize()
diff --git a/FSI/cylinderFlap/OpenFOAM-FEniCS/Solid/cyl-flap.py b/FSI/cylinderFlap/OpenFOAM-FEniCS/Solid/cyl-flap.py
index 7675931dc..6157e9bd6 100644
--- a/FSI/cylinderFlap/OpenFOAM-FEniCS/Solid/cyl-flap.py
+++ b/FSI/cylinderFlap/OpenFOAM-FEniCS/Solid/cyl-flap.py
@@ -229,7 +229,7 @@ def avg(x_old, x_new, alpha):
         n = n_cp
     else:
         u_n.assign(u_np1)
-        t += dt
+        t += float(dt)
         n += 1
 
     if precice.is_time_window_complete():
diff --git a/FSI/flap_perp/OpenFOAM-FEniCS/Solid/perp-flap.py b/FSI/flap_perp/OpenFOAM-FEniCS/Solid/perp-flap.py
index 7977ea0e3..008ffb082 100644
--- a/FSI/flap_perp/OpenFOAM-FEniCS/Solid/perp-flap.py
+++ b/FSI/flap_perp/OpenFOAM-FEniCS/Solid/perp-flap.py
@@ -222,7 +222,7 @@ def avg(x_old, x_new, alpha):
         n = n_cp
     else:
         u_n.assign(u_np1)
-        t += dt
+        t += float(dt)
         n += 1
 
     if precice.is_time_window_complete():
diff --git a/HT/partitioned-heat/fenics-fenics/heat.py b/HT/partitioned-heat/fenics-fenics/heat.py
index 7a4c408e2..21c3742b0 100644
--- a/HT/partitioned-heat/fenics-fenics/heat.py
+++ b/HT/partitioned-heat/fenics-fenics/heat.py
@@ -228,7 +228,7 @@ def determine_gradient(V_g, u, flux):
         n = n_cp
     else:  # update solution
         u_n.assign(u_np1)
-        t += dt
+        t += float(dt)
         n += 1
 
     if precice.is_time_window_complete():
@@ -243,8 +243,8 @@ def determine_gradient(V_g, u, flux):
         error_out << error_pointwise
 
     # Update Dirichlet BC
-    u_D.t = t + dt(0)
-    f.t = t + dt(0)
+    u_D.t = t + float(dt)
+    f.t = t + float(dt)
 
 # Hold plot
 precice.finalize()