diff --git a/src/DynamicModel.cc b/src/DynamicModel.cc
index 1d39cc42e24c5dee2c9159dc7dd8c51c56aa7893..939fe3eda62321cecf8778e8631c3b878806e8bf 100644
--- a/src/DynamicModel.cc
+++ b/src/DynamicModel.cc
@@ -6471,7 +6471,7 @@ DynamicModel::writeJsonParamsDerivativesFile(ostream &output, bool writeDetails)
       else
         rp_output << R"({"row": )" << eq + 1;
 
-      rp_output << R"(, "param_col": )" << param_col + 1;
+      rp_output << R"(, "param_col": )" << param_col;
 
       if (writeDetails)
         rp_output << R"(, "param": ")" << symbol_table.getName(getSymbIDByDerivID(param)) << R"(")";
@@ -6504,8 +6504,8 @@ DynamicModel::writeJsonParamsDerivativesFile(ostream &output, bool writeDetails)
       else
         gp_output << R"({"row": )" << eq + 1;
 
-      gp_output << R"(, "var_col": )" << var_col + 1
-                << R"(, "param_col": )" << param_col + 1;
+      gp_output << R"(, "var_col": )" << var_col
+                << R"(, "param_col": )" << param_col;
 
       if (writeDetails)
         gp_output << R"(, "var": ")" << symbol_table.getName(getSymbIDByDerivID(var)) << R"(")"
@@ -6539,8 +6539,8 @@ DynamicModel::writeJsonParamsDerivativesFile(ostream &output, bool writeDetails)
         rpp_output << R"({"eq": )" << eq + 1;
       else
         rpp_output << R"({"row": )" << eq + 1;
-      rpp_output << R"(, "param1_col": )" << param1_col + 1
-                 << R"(, "param2_col": )" << param2_col + 1;
+      rpp_output << R"(, "param1_col": )" << param1_col
+                 << R"(, "param2_col": )" << param2_col;
 
       if (writeDetails)
         rpp_output << R"(, "param1": ")" << symbol_table.getName(getSymbIDByDerivID(param1)) << R"(")"
@@ -6576,9 +6576,9 @@ DynamicModel::writeJsonParamsDerivativesFile(ostream &output, bool writeDetails)
       else
         gpp_output << R"({"row": )" << eq + 1;
 
-      gpp_output << R"(, "var_col": )" << var_col + 1
-                 << R"(, "param1_col": )" << param1_col + 1
-                 << R"(, "param2_col": )" << param2_col + 1;
+      gpp_output << R"(, "var_col": )" << var_col
+                 << R"(, "param1_col": )" << param1_col
+                 << R"(, "param2_col": )" << param2_col;
 
       if (writeDetails)
         gpp_output << R"(, "var": ")" << symbol_table.getName(getSymbIDByDerivID(var)) << R"(")"
@@ -6616,9 +6616,9 @@ DynamicModel::writeJsonParamsDerivativesFile(ostream &output, bool writeDetails)
       else
         hp_output << R"({"row": )" << eq + 1;
 
-      hp_output << R"(, "var1_col": )" << var1_col + 1
-                << R"(, "var2_col": )" << var2_col + 1
-                << R"(, "param_col": )" << param_col + 1;
+      hp_output << R"(, "var1_col": )" << var1_col
+                << R"(, "var2_col": )" << var2_col
+                << R"(, "param_col": )" << param_col;
 
       if (writeDetails)
         hp_output << R"(, "var1": ")" << symbol_table.getName(getSymbIDByDerivID(var1)) << R"(")"
@@ -6659,10 +6659,10 @@ DynamicModel::writeJsonParamsDerivativesFile(ostream &output, bool writeDetails)
       else
         g3p_output << R"({"row": )" << eq + 1;
 
-      g3p_output << R"(, "var1_col": )" << var1_col + 1
-                 << R"(, "var2_col": )" << var2_col + 1
-                 << R"(, "var3_col": )" << var3_col + 1
-                 << R"(, "param_col": )" << param_col + 1;
+      g3p_output << R"(, "var1_col": )" << var1_col
+                 << R"(, "var2_col": )" << var2_col
+                 << R"(, "var3_col": )" << var3_col
+                 << R"(, "param_col": )" << param_col;
 
       if (writeDetails)
         g3p_output << R"(, "var1": ")" << symbol_table.getName(getSymbIDByDerivID(var1)) << R"(")"