5 files changed, 5 insertions, 5 deletions
diff --git a/src/extension/effect.h b/src/extension/effect.h
index 6616a23ec..193b90a97 100644
--- a/src/extension/effect.h
+++ b/src/extension/effect.h
@@ -20,7 +20,7 @@ namespace Gtk {
 	class VBox;
 }
 
-struct SPDocument;
+class SPDocument;
 
 namespace Inkscape {
 
diff --git a/src/extension/extension.h b/src/extension/extension.h
index dcabb3df7..b6b4c51ed 100644
--- a/src/extension/extension.h
+++ b/src/extension/extension.h
@@ -71,7 +71,7 @@ namespace Gtk {
 #define INKSCAPE_EXTENSION_NS_NC "extension"
 #define INKSCAPE_EXTENSION_NS    "extension:"
 
-struct SPDocument;
+class SPDocument;
 
 namespace Inkscape {
 namespace Extension {
diff --git a/src/extension/internal/filter/filter.h b/src/extension/internal/filter/filter.h
index 1e8a3be0f..9aaa84aec 100644
--- a/src/extension/internal/filter/filter.h
+++ b/src/extension/internal/filter/filter.h
@@ -19,7 +19,7 @@
 namespace Inkscape {
 
 namespace XML {
-	class Document;
+	struct Document;
 }
 
 namespace Extension {
diff --git a/src/extension/internal/pdfinput/svg-builder.h b/src/extension/internal/pdfinput/svg-builder.h
index a550565d6..46cddd73b 100644
--- a/src/extension/internal/pdfinput/svg-builder.h
+++ b/src/extension/internal/pdfinput/svg-builder.h
@@ -19,7 +19,7 @@
 class SPDocument;
 namespace Inkscape {
     namespace XML {
-        class Document;
+        struct Document;
         class Node;
     }
 }
diff --git a/src/extension/output.h b/src/extension/output.h
index 5f6785b8b..c5b1beb45 100644
--- a/src/extension/output.h
+++ b/src/extension/output.h
@@ -15,7 +15,7 @@
 
 #include <gtk/gtk.h>
 #include "extension.h"
-struct SPDocument;
+class SPDocument;
 
 namespace Inkscape {
 namespace Extension {