diff --git a/src/Mod/Fem/femsolver/elmer/writer.py b/src/Mod/Fem/femsolver/elmer/writer.py
index d2048fd8d4..60d1c234ca 100644
--- a/src/Mod/Fem/femsolver/elmer/writer.py
+++ b/src/Mod/Fem/femsolver/elmer/writer.py
@@ -1521,7 +1521,8 @@ class Writer(object):
         s = sifio.createSection(sifio.SOLVER)
         s.priority = equation.Priority
         s["Linear System Solver"] = equation.LinearSolverType
-        s["Linear System Solver Disabled"] = equation.LinearSystemSolverDisabled
+        if equation.LinearSystemSolverDisabled is True:
+            s["Linear System Solver Disabled"] = equation.LinearSystemSolverDisabled
         if equation.LinearSolverType == "Direct":
             s["Linear System Direct Method"] = \
                 equation.LinearDirectMethod