diff --git a/source/index.ts b/source/index.ts
index 3e68b19..e8e6506 100644
--- a/source/index.ts
+++ b/source/index.ts
@@ -368,7 +368,7 @@ is.oddInteger = isAbsoluteMod2(1);
 
 is.emptyArray = (value: unknown): value is never[] => is.array(value) && value.length === 0;
 
-is.nonEmptyArray = (value: unknown): value is unknown[] => is.array(value) && value.length > 0;
+is.nonEmptyArray = (value: unknown): value is [unknown, ...unknown[]] => is.array(value) && value.length > 0;
 
 is.emptyString = (value: unknown): value is '' => is.string(value) && value.length === 0;
 
@@ -559,7 +559,7 @@ interface Assert {
 	nodeStream: (value: unknown) => asserts value is NodeStream;
 	infinite: (value: unknown) => asserts value is number;
 	emptyArray: (value: unknown) => asserts value is never[];
-	nonEmptyArray: (value: unknown) => asserts value is unknown[];
+	nonEmptyArray: (value: unknown) => asserts value is [unknown, ...unknown[]];
 	emptyString: (value: unknown) => asserts value is '';
 	emptyStringOrWhitespace: (value: unknown) => asserts value is string;
 	nonEmptyString: (value: unknown) => asserts value is string;
@@ -665,7 +665,7 @@ export const assert: Assert = {
 	nodeStream: (value: unknown): asserts value is NodeStream => assertType(is.nodeStream(value), AssertionTypeDescription.nodeStream, value),
 	infinite: (value: unknown): asserts value is number => assertType(is.infinite(value), AssertionTypeDescription.infinite, value),
 	emptyArray: (value: unknown): asserts value is never[] => assertType(is.emptyArray(value), AssertionTypeDescription.emptyArray, value),
-	nonEmptyArray: (value: unknown): asserts value is unknown[] => assertType(is.nonEmptyArray(value), AssertionTypeDescription.nonEmptyArray, value),
+	nonEmptyArray: (value: unknown): asserts value is [unknown, ...unknown[]] => assertType(is.nonEmptyArray(value), AssertionTypeDescription.nonEmptyArray, value),
 	emptyString: (value: unknown): asserts value is '' => assertType(is.emptyString(value), AssertionTypeDescription.emptyString, value),
 	emptyStringOrWhitespace: (value: unknown): asserts value is string => assertType(is.emptyStringOrWhitespace(value), AssertionTypeDescription.emptyStringOrWhitespace, value),
 	nonEmptyString: (value: unknown): asserts value is string => assertType(is.nonEmptyString(value), AssertionTypeDescription.nonEmptyString, value),