diff --git a/library/io.m b/library/io.m
index 74b8114a9..0fde26c4f 100644
--- a/library/io.m
+++ b/library/io.m
@@ -4229,8 +4229,6 @@ io.resize_buffer(_OldSize, NewSize, buffer(Array0), buffer(Array)) :-
     [will_not_call_mercury, promise_pure, tabled_for_io, thread_safe,
         does_not_affect_liveness],
 "{
-    int i;
-
     Str = Buffer;
     Str[Len] = '\\0';