diff --git a/src/proto.h b/src/proto.h
index 3c34fe8132..e9e5efcbc5 100644
--- a/src/proto.h
+++ b/src/proto.h
@@ -73,9 +73,7 @@ extern int _stricoll(char *a, char *b);
 # include "if_cscope.pro"
 # include "debugger.pro"
 # include "dict.pro"
-# ifdef FEAT_DIFF
 # include "diff.pro"
-# endif
 # include "linematch.pro"
 # include "digraph.pro"
 # include "drawline.pro"
diff --git a/src/structs.h b/src/structs.h
index d7b4580774..0968b3c9a9 100644
--- a/src/structs.h
+++ b/src/structs.h
@@ -3671,6 +3671,9 @@ struct diffline_S
     int bufidx;
     int lineoff;
 };
+#else  // FEAT_DIFF
+typedef void diffline_T;
+typedef void diffline_change_T;
 #endif
 
 #define SNAP_HELP_IDX	0
diff --git a/src/version.c b/src/version.c
index 359790bfd1..0d7d245c09 100644
--- a/src/version.c
+++ b/src/version.c
@@ -724,6 +724,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1654,
 /**/
     1653,
 /**/