1 files changed, 2 insertions, 2 deletions
diff --git a/src/filter-chemistry.h b/src/filter-chemistry.h
index b00e33bcc..2ac3ebe8f 100644
--- a/src/filter-chemistry.h
+++ b/src/filter-chemistry.h
@@ -19,8 +19,8 @@
 #include "display/nr-filter-types.h"
 
 class SPDocument;
-struct SPFilter;
-struct SPFilterPrimitive;
+class SPFilter;
+class SPFilterPrimitive;
 class SPItem;
 class SPObject;