diff --git a/src/layout/floating.rs b/src/layout/floating.rs
index dfeb18c1f..39adf7aab 100644
--- a/src/layout/floating.rs
+++ b/src/layout/floating.rs
@@ -20,7 +20,7 @@ use crate::render_helpers::RenderTarget;
 use crate::utils::transaction::TransactionBlocker;
 use crate::utils::{
     center_preferring_top_left_in_area, clamp_preferring_top_left_in_area, ensure_min_max_size,
-    ResizeEdge,
+    ensure_min_max_size_maybe_zero, ResizeEdge,
 };
 use crate::window::ResolvedWindowRules;
 
@@ -386,15 +386,14 @@ impl<W: LayoutElement> FloatingSpace<W> {
             // fullscreen until now), fall back to (0, 0).
             floating_size.unwrap_or_else(|| win.expected_size().unwrap_or_default())
         };
-        // Make sure fixed-size through window rules keeps working.
+
+        // Apply min/max size window rules. If requesting a concrete size, apply completely; if
+        // requesting (0, 0), apply only when min/max results in a fixed size.
         let min_size = win.min_size();
         let max_size = win.max_size();
-        if min_size.w != 0 && min_size.w == max_size.w {
-            size.w = min_size.w;
-        }
-        if min_size.h != 0 && min_size.h == max_size.h {
-            size.h = min_size.h;
-        }
+        size.w = ensure_min_max_size_maybe_zero(size.w, min_size.w, max_size.w);
+        size.h = ensure_min_max_size_maybe_zero(size.h, min_size.h, max_size.h);
+
         win.request_size_once(size, true);
 
         if activate || self.tiles.is_empty() {
diff --git a/src/layout/mod.rs b/src/layout/mod.rs
index a09a99884..535491545 100644
--- a/src/layout/mod.rs
+++ b/src/layout/mod.rs
@@ -62,7 +62,10 @@ use crate::render_helpers::texture::TextureBuffer;
 use crate::render_helpers::{BakedBuffer, RenderTarget, SplitElements};
 use crate::rubber_band::RubberBand;
 use crate::utils::transaction::{Transaction, TransactionBlocker};
-use crate::utils::{output_matches_name, output_size, round_logical_in_physical_max1, ResizeEdge};
+use crate::utils::{
+    ensure_min_max_size_maybe_zero, output_matches_name, output_size,
+    round_logical_in_physical_max1, ResizeEdge,
+};
 use crate::window::ResolvedWindowRules;
 
 pub mod closing_window;
@@ -2698,15 +2701,15 @@ impl<W: LayoutElement> Layout<W> {
                     let win = move_.tile.window_mut();
                     let mut size =
                         floating_size.unwrap_or_else(|| win.expected_size().unwrap_or_default());
-                    // Make sure fixed-size through window rules keeps working.
+
+                    // Apply min/max size window rules. If requesting a concrete size, apply
+                    // completely; if requesting (0, 0), apply only when min/max results in a fixed
+                    // size.
                     let min_size = win.min_size();
                     let max_size = win.max_size();
-                    if min_size.w != 0 && min_size.w == max_size.w {
-                        size.w = min_size.w;
-                    }
-                    if min_size.h != 0 && min_size.h == max_size.h {
-                        size.h = min_size.h;
-                    }
+                    size.w = ensure_min_max_size_maybe_zero(size.w, min_size.w, max_size.w);
+                    size.h = ensure_min_max_size_maybe_zero(size.h, min_size.h, max_size.h);
+
                     win.request_size_once(size, true);
                 }
                 return;
@@ -3277,15 +3280,13 @@ impl<W: LayoutElement> Layout<W> {
                         Size::from((0, 0))
                     };
 
-                    // Make sure fixed-size through window rules keeps working.
+                    // Apply min/max size window rules. If requesting a concrete size, apply
+                    // completely; if requesting (0, 0), apply only when min/max results in a fixed
+                    // size.
                     let min_size = win.min_size();
                     let max_size = win.max_size();
-                    if min_size.w != 0 && min_size.w == max_size.w {
-                        size.w = min_size.w;
-                    }
-                    if min_size.h != 0 && min_size.h == max_size.h {
-                        size.h = min_size.h;
-                    }
+                    size.w = ensure_min_max_size_maybe_zero(size.w, min_size.w, max_size.w);
+                    size.h = ensure_min_max_size_maybe_zero(size.h, min_size.h, max_size.h);
 
                     win.request_size_once(size, true);
 
diff --git a/src/tests/floating.rs b/src/tests/floating.rs
index ece1a5dc1..8b63d55d8 100644
--- a/src/tests/floating.rs
+++ b/src/tests/floating.rs
@@ -1,5 +1,6 @@
 use client::ClientId;
 use insta::assert_snapshot;
+use niri_config::Config;
 use niri_ipc::SizeChange;
 use smithay::utils::Point;
 use wayland_client::protocol::wl_surface::WlSurface;
@@ -785,3 +786,71 @@ fn floating_doesnt_store_fullscreen_size() {
         @"size: 100 × 100, bounds: 1920 × 1080, states: [Activated]"
     );
 }
+
+#[test]
+fn floating_respects_non_fixed_min_max_rule() {
+    let config = r##"
+window-rule {
+    min-width 200
+    max-width 300
+}
+"##;
+    let config = Config::parse("test.kdl", config).unwrap();
+    let mut f = Fixture::with_config(config);
+    f.add_output(1, (1920, 1080));
+    f.add_output(2, (1280, 720));
+
+    let id = f.add_client();
+    let window = f.client(id).create_window();
+    let surface = window.surface.clone();
+    window.commit();
+    f.roundtrip(id);
+
+    // Open with smaller width than min.
+    let window = f.client(id).window(&surface);
+    window.attach_new_buffer();
+    window.set_size(100, 100);
+    window.ack_last_and_commit();
+    f.double_roundtrip(id);
+
+    // Commit to the Activated state configure.
+    f.client(id).window(&surface).ack_last_and_commit();
+    f.double_roundtrip(id);
+
+    let _ = f.client(id).window(&surface).recent_configures();
+
+    // Make it floating.
+    f.niri().layout.toggle_window_floating(None);
+    f.double_roundtrip(id);
+
+    // This should clamp to min-width and request 200 × 100.
+    assert_snapshot!(
+        f.client(id).window(&surface).format_recent_configures(),
+        @"size: 200 × 100, bounds: 1920 × 1080, states: [Activated]"
+    );
+
+    // Commit with a bigger width than max.
+    let window = f.client(id).window(&surface);
+    window.set_size(400, 100);
+    window.ack_last_and_commit();
+    f.roundtrip(id);
+
+    // Make it tiling.
+    f.niri().layout.toggle_window_floating(None);
+    f.double_roundtrip(id);
+
+    let _ = f.client(id).window(&surface).recent_configures();
+
+    f.client(id).window(&surface).ack_last_and_commit();
+    f.roundtrip(id);
+
+    // Make it floating.
+    f.niri().layout.toggle_window_floating(None);
+    f.double_roundtrip(id);
+
+    // This should clamp to max-width and request 300 × 100.
+    assert_snapshot!(
+        f.client(id).window(&surface).format_recent_configures(),
+        @"size: 300 × 100, bounds: 1920 × 1080, states: [Activated]"
+    );
+}
diff --git a/src/utils/mod.rs b/src/utils/mod.rs
index 7ab89a72d..28cebf2c6 100644
--- a/src/utils/mod.rs
+++ b/src/utils/mod.rs
@@ -272,6 +272,16 @@ pub fn ensure_min_max_size(mut x: i32, min_size: i32, max_size: i32) -> i32 {
     x
 }
 
+pub fn ensure_min_max_size_maybe_zero(x: i32, min_size: i32, max_size: i32) -> i32 {
+    if x != 0 {
+        ensure_min_max_size(x, min_size, max_size)
+    } else if min_size > 0 && min_size == max_size {
+        min_size
+    } else {
+        0
+    }
+}
+
 pub fn clamp_preferring_top_left_in_area(
     area: Rectangle<f64, Logical>,
     rect: &mut Rectangle<f64, Logical>,