diff --git a/dlls/sane.ds/sane_i.h b/dlls/sane.ds/sane_i.h
index 941e8b9e1b9..9351bdc2229 100644
--- a/dlls/sane.ds/sane_i.h
+++ b/dlls/sane.ds/sane_i.h
@@ -36,7 +36,7 @@
 #include "twain.h"
 
 #ifdef SONAME_LIBSANE
-#define MAKE_FUNCPTR(f) typeof(f) * p##f DECLSPEC_HIDDEN;
+#define MAKE_FUNCPTR(f) extern typeof(f) * p##f DECLSPEC_HIDDEN;
 MAKE_FUNCPTR(sane_init)
 MAKE_FUNCPTR(sane_exit)
 MAKE_FUNCPTR(sane_get_devices)
@@ -84,7 +84,9 @@ struct tagActiveDS
     TW_FIX32            defaultXResolution;
     BOOL                YResolutionSet;
     TW_FIX32            defaultYResolution;
-} activeDS DECLSPEC_HIDDEN;
+};
+
+extern struct tagActiveDS activeDS DECLSPEC_HIDDEN;
 
 /* Helper functions */
 extern TW_UINT16 SANE_SaneCapability (pTW_CAPABILITY pCapability, TW_UINT16 action) DECLSPEC_HIDDEN;
diff --git a/dlls/sane.ds/sane_main.c b/dlls/sane.ds/sane_main.c
index 7af0a2321ac..0cf211d0983 100644
--- a/dlls/sane.ds/sane_main.c
+++ b/dlls/sane.ds/sane_main.c
@@ -30,9 +30,27 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(twain);
 
+struct tagActiveDS activeDS;
+
 DSMENTRYPROC SANE_dsmentry;
 
 #ifdef SONAME_LIBSANE
+#define MAKE_FUNCPTR(f) typeof(f) * p##f;
+MAKE_FUNCPTR(sane_init)
+MAKE_FUNCPTR(sane_exit)
+MAKE_FUNCPTR(sane_get_devices)
+MAKE_FUNCPTR(sane_open)
+MAKE_FUNCPTR(sane_close)
+MAKE_FUNCPTR(sane_get_option_descriptor)
+MAKE_FUNCPTR(sane_control_option)
+MAKE_FUNCPTR(sane_get_parameters)
+MAKE_FUNCPTR(sane_start)
+MAKE_FUNCPTR(sane_read)
+MAKE_FUNCPTR(sane_cancel)
+MAKE_FUNCPTR(sane_set_io_mode)
+MAKE_FUNCPTR(sane_get_select_fd)
+MAKE_FUNCPTR(sane_strstatus)
+#undef MAKE_FUNCPTR
 
 HINSTANCE SANE_instance;