diff --git a/src/main/java/de/hhu/stups/sablecc/gradle/SableCCTask.java b/src/main/java/de/hhu/stups/sablecc/gradle/SableCCTask.java
index cd7480e4d2c0c403a262576cc5f9edd2d0397705..8dfdef21c4c59046d8c23c615295e54c68c41243 100644
--- a/src/main/java/de/hhu/stups/sablecc/gradle/SableCCTask.java
+++ b/src/main/java/de/hhu/stups/sablecc/gradle/SableCCTask.java
@@ -31,6 +31,7 @@ public class SableCCTask extends SourceTask {
 		super();
 		
 		this.sableCCClasspath = null;
+		this.maxHeapSize = null;
 		this.destinationJavaDir = this.getProject().getObjects().directoryProperty();
 		this.destinationResourcesDir = this.getProject().getObjects().directoryProperty();
 	}