diff --git a/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/ServerProperties.java b/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/ServerProperties.java
index d4e2d4ba876..5fa0645b0a3 100644
--- a/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/ServerProperties.java
+++ b/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/ServerProperties.java
@@ -834,7 +834,7 @@ public class ServerProperties
 			if (maxHttpHeaderSize > 0) {
 				customizeMaxHttpHeaderSize(factory, maxHttpHeaderSize);
 			}
-			if (this.maxHttpPostSize > 0) {
+			if (this.maxHttpPostSize != 0) {
 				customizeMaxHttpPostSize(factory, this.maxHttpPostSize);
 			}
 			if (this.accesslog.enabled) {
diff --git a/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/ServerPropertiesTests.java b/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/ServerPropertiesTests.java
index e6819d95c1e..aaf1641b7e2 100644
--- a/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/ServerPropertiesTests.java
+++ b/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/ServerPropertiesTests.java
@@ -574,6 +574,25 @@ public class ServerPropertiesTests {
 		}
 	}
 
+	@Test
+	public void customTomcatDisableMaxHttpPostSize() {
+		Map<String, String> map = new HashMap<String, String>();
+		map.put("server.tomcat.max-http-post-size", "-1");
+		bindProperties(map);
+		TomcatEmbeddedServletContainerFactory container = new TomcatEmbeddedServletContainerFactory(0);
+		this.properties.customize(container);
+		TomcatEmbeddedServletContainer embeddedContainer =
+			(TomcatEmbeddedServletContainer) container.getEmbeddedServletContainer();
+		embeddedContainer.start();
+		try {
+			assertThat(embeddedContainer.getTomcat().getConnector().getMaxPostSize())
+				.isEqualTo(-1);
+		}
+		finally {
+			embeddedContainer.stop();
+		}
+	}
+
 	@Test
 	@Deprecated
 	public void customTomcatMaxHttpPostSizeWithDeprecatedProperty() {