diff --git a/wgpu-core/src/device/mod.rs b/wgpu-core/src/device/mod.rs
index cf43aecf7..d6061a7fc 100644
--- a/wgpu-core/src/device/mod.rs
+++ b/wgpu-core/src/device/mod.rs
@@ -1483,6 +1483,7 @@ impl<B: GfxBackend> Device<B> {
 
         // `BTreeMap` has ordered bindings as keys, which allows us to coalesce
         // the descriptor writes into a single transaction.
+        let mut desc_set; // early declaration so it's dropped after write_map
         let mut write_map = BTreeMap::new();
         let mut used_buffer_ranges = Vec::new();
         for entry in desc.entries.iter() {
@@ -1776,7 +1777,7 @@ impl<B: GfxBackend> Device<B> {
             self.desc_allocator
                 .lock()
                 .allocate(&self.raw, &layout.raw, &layout.desc_count, 1)?;
-        let mut desc_set = desc_sets.pop().unwrap();
+        desc_set = desc_sets.pop().unwrap();
 
         // Set the descriptor set's label for easier debugging.
         if let Some(label) = desc.label.as_ref() {