diff --git a/fpdfsdk/javascript/cjs_scalewhen.h b/fpdfsdk/javascript/cjs_scalewhen.h
index 7aa9721..50a723b 100644
--- a/fpdfsdk/javascript/cjs_scalewhen.h
+++ b/fpdfsdk/javascript/cjs_scalewhen.h
@@ -18,7 +18,7 @@
 
  private:
   static int ObjDefnID;
-  static JSConstSpec ConstSpecs[];
+  static const JSConstSpec ConstSpecs[];
 };
 
 #endif  // FPDFSDK_JAVASCRIPT_CJS_SCALEWHEN_H_