diff --git a/spring-test/src/main/java/org/springframework/test/web/servlet/request/AbstractMockHttpServletRequestBuilder.java b/spring-test/src/main/java/org/springframework/test/web/servlet/request/AbstractMockHttpServletRequestBuilder.java
index ac46d9b660c8..695d7b264569 100644
--- a/spring-test/src/main/java/org/springframework/test/web/servlet/request/AbstractMockHttpServletRequestBuilder.java
+++ b/spring-test/src/main/java/org/springframework/test/web/servlet/request/AbstractMockHttpServletRequestBuilder.java
@@ -447,7 +447,7 @@ public B headers(Consumer<HttpHeaders> headersConsumer) {
 	 * @param name the parameter name
 	 * @param values one or more values
 	 */
-	public B param(String name, String... values) {
+	public B param(String name, @Nullable String... values) {
 		this.parameters.addAll(name, Arrays.asList(values));
 		return self();
 	}
diff --git a/spring-test/src/main/kotlin/org/springframework/test/web/servlet/MockHttpServletRequestDsl.kt b/spring-test/src/main/kotlin/org/springframework/test/web/servlet/MockHttpServletRequestDsl.kt
index 782cf10b2270..68be842b2d1b 100644
--- a/spring-test/src/main/kotlin/org/springframework/test/web/servlet/MockHttpServletRequestDsl.kt
+++ b/spring-test/src/main/kotlin/org/springframework/test/web/servlet/MockHttpServletRequestDsl.kt
@@ -107,7 +107,7 @@ open class MockHttpServletRequestDsl(private val builder: AbstractMockHttpServle
 	/**
 	 * @see [MockHttpServletRequestBuilder.param]
 	 */
-	fun param(name: String, vararg values: String) {
+	fun param(name: String, vararg values: String?) {
 		builder.param(name, *values)
 	}