diff --git a/deno/lib/__tests__/nonNullable.test.ts b/deno/lib/__tests__/nonNullable.test.ts
index b0ee7263f..160212644 100644
--- a/deno/lib/__tests__/nonNullable.test.ts
+++ b/deno/lib/__tests__/nonNullable.test.ts
@@ -19,13 +19,21 @@ test("parses a number correctly using z.nonNullable(...)", () => {
 });
 
 test("fails is passed null", () => {
-  const a = z.nullable(z.number()).nonNullable();
+  const a = z.nullable(z.any()).nonNullable();
 
   expect(() => {
     a.parse(null);
   }).toThrow(z.ZodError)
 });
 
+test("fails is passed undefined", () => {
+  const a = z.nullable(z.any()).nonNullable();
+
+  expect(() => {
+    a.parse(undefined);
+  }).toThrow(z.ZodError)
+});
+
 test("unwrap", () => {
   const unwrapped = z.any().nonNullable().unwrap();
   expect(unwrapped).toBeInstanceOf(z.ZodAny);
diff --git a/deno/lib/types.ts b/deno/lib/types.ts
index a8b326910..74f9590f1 100644
--- a/deno/lib/types.ts
+++ b/deno/lib/types.ts
@@ -4480,7 +4480,10 @@ export class ZodNonNullable<T extends ZodTypeAny> extends ZodType<
 > {
   _parse(input: ParseInput): ParseReturnType<this["_output"]> {
     const parsedType = this._getType(input);
-    if (parsedType === ZodParsedType.null) {
+    if (
+      parsedType === ZodParsedType.null ||
+      parsedType === ZodParsedType.undefined
+    ) {
       const { ctx } = this._processInputParams(input);
       addIssueToContext(ctx, {
         code: ZodIssueCode.invalid_type,
diff --git a/src/__tests__/nonNullable.test.ts b/src/__tests__/nonNullable.test.ts
index 40993b41d..d8bf7c671 100644
--- a/src/__tests__/nonNullable.test.ts
+++ b/src/__tests__/nonNullable.test.ts
@@ -18,13 +18,21 @@ test("parses a number correctly using z.nonNullable(...)", () => {
 });
 
 test("fails is passed null", () => {
-  const a = z.nullable(z.number()).nonNullable();
+  const a = z.nullable(z.any()).nonNullable();
 
   expect(() => {
     a.parse(null);
   }).toThrow(z.ZodError)
 });
 
+test("fails is passed undefined", () => {
+  const a = z.nullable(z.any()).nonNullable();
+
+  expect(() => {
+    a.parse(undefined);
+  }).toThrow(z.ZodError)
+});
+
 test("unwrap", () => {
   const unwrapped = z.any().nonNullable().unwrap();
   expect(unwrapped).toBeInstanceOf(z.ZodAny);
diff --git a/src/types.ts b/src/types.ts
index 6e3aae807..31b74deaf 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -4480,7 +4480,10 @@ export class ZodNonNullable<T extends ZodTypeAny> extends ZodType<
 > {
   _parse(input: ParseInput): ParseReturnType<this["_output"]> {
     const parsedType = this._getType(input);
-    if (parsedType === ZodParsedType.null) {
+    if (
+      parsedType === ZodParsedType.null ||
+      parsedType === ZodParsedType.undefined
+    ) {
       const { ctx } = this._processInputParams(input);
       addIssueToContext(ctx, {
         code: ZodIssueCode.invalid_type,