diff --git a/lib/circuitJsonToSpice.ts b/lib/circuitJsonToSpice.ts
index 0f4b42c..900afdb 100644
--- a/lib/circuitJsonToSpice.ts
+++ b/lib/circuitJsonToSpice.ts
@@ -372,7 +372,18 @@ export function circuitJsonToSpice(
             const modelName = `${modelType}_${mosfet_mode.toUpperCase()}`
 
             if (!netlist.models.has(modelName)) {
-              netlist.models.set(modelName, `.MODEL ${modelName} ${modelType}`)
+              if (mosfet_mode === "enhancement") {
+                const vto = channel_type === "p" ? -1 : 1
+                netlist.models.set(
+                  modelName,
+                  `.MODEL ${modelName} ${modelType} (VTO=${vto} KP=0.1)`,
+                )
+              } else {
+                netlist.models.set(
+                  modelName,
+                  `.MODEL ${modelName} ${modelType} (KP=0.1)`,
+                )
+              }
             }
 
             const mosfetCmd = new MOSFETCommand({
diff --git a/tests/examples/boost-converter.test.tsx b/tests/examples/boost-converter.test.tsx
index 93d79f1..a882698 100644
--- a/tests/examples/boost-converter.test.tsx
+++ b/tests/examples/boost-converter.test.tsx
@@ -17,7 +17,7 @@ test(
     expect(spiceString).toMatchInlineSnapshot(`
       "* Circuit JSON to SPICE Netlist
       .MODEL D D
-      .MODEL NMOS_ENHANCEMENT NMOS
+      .MODEL NMOS_ENHANCEMENT NMOS (VTO=1 KP=0.1)
       LL1 N1 N2 1
       DD1 N2 N3 D
       CC1 N3 0 10U
diff --git a/tests/examples/buck-converter.test.tsx b/tests/examples/buck-converter.test.tsx
index 59cfc74..171934e 100644
--- a/tests/examples/buck-converter.test.tsx
+++ b/tests/examples/buck-converter.test.tsx
@@ -12,7 +12,7 @@ test(
 
     expect(spiceString).toMatchInlineSnapshot(`
       "* Circuit JSON to SPICE Netlist
-      .MODEL PMOS_ENHANCEMENT PMOS
+      .MODEL PMOS_ENHANCEMENT PMOS (VTO=-1 KP=0.1)
       .MODEL D D
       MM1 N2 N1 VP_IN VP_IN PMOS_ENHANCEMENT
       DD1 0 N2 D