diff --git a/mozilla/widget/public/nsIPrintingContext.h b/mozilla/widget/public/nsIPrintingContext.h
index ee5f26f0c2b..bb8764d460f 100644
--- a/mozilla/widget/public/nsIPrintingContext.h
+++ b/mozilla/widget/public/nsIPrintingContext.h
@@ -50,7 +50,7 @@ class nsIPrintSettings;
 
 class nsIPrintingContext : public nsISupports {
 public:
-    NS_DEFINE_STATIC_IID_ACCESSOR(NS_IPRINTING_CONTEXT_IID)
+    NS_DECLARE_STATIC_IID_ACCESSOR(NS_IPRINTING_CONTEXT_IID)
     /**
      * Initialize the printing context for use.
      * @param aIsPrintPreview   TRUE if doing print preview, FALSE if normal printing.
@@ -89,4 +89,6 @@ public:
     NS_IMETHOD GetPageRect(double* aTop, double* aLeft, double* aBottom, double* aRight) = 0;
 };
 
+NS_DEFINE_STATIC_IID_ACCESSOR(nsIPrintingContext, NS_IPRINTING_CONTEXT_IID)
+
 #endif /* nsIPrintingContextMac_h___ */