diff --git a/crates/uv-resolver/src/resolution/display.rs b/crates/uv-resolver/src/resolution/display.rs
index 2e8af1380..2968074b7 100644
--- a/crates/uv-resolver/src/resolution/display.rs
+++ b/crates/uv-resolver/src/resolution/display.rs
@@ -404,6 +404,13 @@ fn strip_extras<'dist>(graph: &IntermediatePetGraph<'dist>) -> RequirementsTxtGr
                 let index = *entry.get();
                 let node: &mut RequirementsTxtDist = &mut next[index];
                 node.extras.clear();
+                // Consider:
+                // ```
+                // foo[bar]==1.0.0; sys_platform == 'linux'
+                // foo==1.0.0; sys_platform != 'linux'
+                // ```
+                // In this case, we want to write `foo==1.0.0; sys_platform == 'linux' or sys_platform == 'windows'`
+                node.markers.or(dist.markers);
             }
             std::collections::hash_map::Entry::Vacant(entry) => {
                 let index = next.add_node(dist.clone());
diff --git a/crates/uv/tests/it/pip_compile.rs b/crates/uv/tests/it/pip_compile.rs
index 4fcb2c6a3..f7d62c222 100644
--- a/crates/uv/tests/it/pip_compile.rs
+++ b/crates/uv/tests/it/pip_compile.rs
@@ -9130,7 +9130,7 @@ fn universal_disjoint_extra() -> Result<()> {
         # via flask
     click==8.1.7 ; sys_platform == 'darwin' or sys_platform == 'linux'
         # via flask
-    flask==3.0.2 ; sys_platform == 'linux'
+    flask==3.0.2 ; sys_platform == 'darwin' or sys_platform == 'linux'
         # via -r requirements.in
     itsdangerous==2.1.2 ; sys_platform == 'darwin' or sys_platform == 'linux'
         # via flask
@@ -14554,3 +14554,38 @@ fn compile_preserve_requires_python_split() -> Result<()> {
 
     Ok(())
 }
+
+/// Regression test for <https://github.com/astral-sh/uv/issues/11279#issuecomment-2640270189>
+#[test]
+fn markers_on_extra_packages() -> Result<()> {
+    let context = TestContext::new("3.12");
+    let requirements_in = context.temp_dir.child("requirements.in");
+    requirements_in.write_str(indoc! {"
+        psycopg[binary]; platform_python_implementation != 'PyPy'
+        psycopg; platform_python_implementation == 'PyPy'
+    "})?;
+
+    uv_snapshot!(context
+        .pip_compile()
+        .arg("--universal")
+        .arg("requirements.in"), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+    # This file was autogenerated by uv via the following command:
+    #    uv pip compile --cache-dir [CACHE_DIR] --universal requirements.in
+    psycopg==3.1.18
+        # via -r requirements.in
+    psycopg-binary==3.1.18 ; implementation_name != 'pypy' and platform_python_implementation != 'PyPy'
+        # via psycopg
+    typing-extensions==4.10.0
+        # via psycopg
+    tzdata==2024.1 ; sys_platform == 'win32'
+        # via psycopg
+
+    ----- stderr -----
+    Resolved 4 packages in [TIME]
+    "###);
+
+    Ok(())
+}