diff --git a/dlls/gphoto2.ds/gphoto2_i.h b/dlls/gphoto2.ds/gphoto2_i.h
index 02f5d11c95f..373c6fc611d 100644
--- a/dlls/gphoto2.ds/gphoto2_i.h
+++ b/dlls/gphoto2.ds/gphoto2_i.h
@@ -101,7 +101,7 @@ struct tagActiveDS
     struct jpeg_decompress_struct	jd;
     struct jpeg_error_mgr		jerr;
 #endif
-} activeDS;
+} activeDS DECLSPEC_HIDDEN;
 
 /* Helper functions */
 extern TW_UINT16 GPHOTO2_SaneCapability (pTW_CAPABILITY pCapability, TW_UINT16 action) DECLSPEC_HIDDEN;