diff --git a/src/gpu/GrPrimitiveProcessor.h b/src/gpu/GrPrimitiveProcessor.h
index eb59d98..375b512 100644
--- a/src/gpu/GrPrimitiveProcessor.h
+++ b/src/gpu/GrPrimitiveProcessor.h
@@ -52,6 +52,9 @@
         InputRate            fInputRate;
     };
 
+    GrPrimitiveProcessor(ClassID classID)
+    : GrResourceIOProcessor(classID) {}
+
     int numAttribs() const { return fAttribs.count(); }
     const Attribute& getAttrib(int index) const { return fAttribs[index]; }