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-rw-r--r--src/rt/rust_builtin.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/rt/rust_builtin.cpp b/src/rt/rust_builtin.cpp
index c5725f0e392..69bc88157f0 100644
--- a/src/rt/rust_builtin.cpp
+++ b/src/rt/rust_builtin.cpp
@@ -102,7 +102,7 @@ extern "C" CDECL void
 vec_reserve_shared(type_desc* ty, rust_vec** vp,
                    size_t n_elts) {
     rust_task *task = rust_task_thread::get_task();
-    reserve_vec(task, vp, n_elts * ty->size);
+    reserve_vec_exact(task, vp, n_elts * ty->size);
 }
 
 /**