diff --git a/spring-cloud-stream/src/main/java/org/springframework/cloud/stream/function/StreamFunctionProperties.java b/spring-cloud-stream/src/main/java/org/springframework/cloud/stream/function/StreamFunctionProperties.java
index 4b89cf6da..3ab84e86c 100644
--- a/spring-cloud-stream/src/main/java/org/springframework/cloud/stream/function/StreamFunctionProperties.java
+++ b/spring-cloud-stream/src/main/java/org/springframework/cloud/stream/function/StreamFunctionProperties.java
@@ -70,7 +70,7 @@ public class StreamFunctionProperties {
 		return this.filterBindings(functionName, "-in-");
 	}
 
-	public void setDefinition(String definition) {
+	void setDefinition(String definition) {
 		if (StringUtils.hasText(definition)) {
 			this.composeFrom = definition.startsWith("|");
 			this.composeTo = definition.endsWith("|");