diff --git a/CHANGELOG.md b/CHANGELOG.md
index f65b7e8857..61da7136c6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -68,6 +68,7 @@ Bottom level categories:
         - `tanh`
     - [#5098](https://github.com/gfx-rs/wgpu/pull/5098) by @ErichDonGubler:
         - `ceil`
+        - `floor`
 - Eager release of GPU resources comes from device.trackers. By @bradwerth in [#5075](https://github.com/gfx-rs/wgpu/pull/5075)
 - `wgpu-types`'s `trace` and `replay` features have been replaced by the `serde` feature. By @KirmesBude in [#5149](https://github.com/gfx-rs/wgpu/pull/5149)
 - `wgpu-core`'s `serial-pass` feature has been removed. Use `serde` instead. By @KirmesBude in [#5149](https://github.com/gfx-rs/wgpu/pull/5149)
diff --git a/naga/src/proc/constant_evaluator.rs b/naga/src/proc/constant_evaluator.rs
index d1ee99e02f..4c6ae058a9 100644
--- a/naga/src/proc/constant_evaluator.rs
+++ b/naga/src/proc/constant_evaluator.rs
@@ -865,6 +865,9 @@ impl<'a> ConstantEvaluator<'a> {
             crate::MathFunction::Cosh => {
                 component_wise_float!(self, span, [arg], |e| { Ok([e.cosh()]) })
             }
+            crate::MathFunction::Floor => {
+                component_wise_float!(self, span, [arg], |e| { Ok([e.floor()]) })
+            }
             crate::MathFunction::Round => {
                 // TODO: Use `f{32,64}.round_ties_even()` when available on stable. This polyfill
                 // is shamelessly [~~stolen from~~ inspired by `ndarray-image`][polyfill source],