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-rw-r--r--src/nvim/undo.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/nvim/undo.c b/src/nvim/undo.c
index 59920cfbe1..4d84c69158 100644
--- a/src/nvim/undo.c
+++ b/src/nvim/undo.c
@@ -128,7 +128,7 @@ static int undo_undoes = FALSE;
static int lastmark = 0;
-#if defined(U_DEBUG) || defined(PROTO)
+#if defined(U_DEBUG)
/*
* Check the undo structures for being valid. Print a warning when something
* looks wrong.