diff --git a/core/src/main/java/hudson/tools/ToolDescriptor.java b/core/src/main/java/hudson/tools/ToolDescriptor.java
index 3c944d86dc31c9b326268bcf8c361ed25a27e337..3389d1bf8fa85936fa951a3a092deabcb1db4f07 100644
--- a/core/src/main/java/hudson/tools/ToolDescriptor.java
+++ b/core/src/main/java/hudson/tools/ToolDescriptor.java
@@ -54,6 +54,14 @@ public abstract class ToolDescriptor<T extends ToolInstallation> extends Descrip
 
     private T[] installations;
 
+    protected ToolDescriptor() {
+        super();
+    }
+
+    protected ToolDescriptor(Class<T> clazz) {
+        super(clazz);
+    }
+
     /**
      * Configured instances of {@link ToolInstallation}s.
      *