diff --git a/crate_universe/src/metadata.rs b/crate_universe/src/metadata.rs
index c84bfbb..458a573 100644
--- a/crate_universe/src/metadata.rs
+++ b/crate_universe/src/metadata.rs
@@ -563,12 +563,15 @@
                 })?
                 .to_owned(),
         );
-        let features = if parts[2].is_empty() {
+        let mut features = if parts[2].is_empty() {
             BTreeSet::new()
         } else {
             parts[2].split(',').map(str::to_owned).collect()
         };
-        crate_features.insert(crate_id, features);
+        crate_features
+            .entry(crate_id)
+            .or_default()
+            .append(&mut features);
     }
     Ok(crate_features)
 }
@@ -664,9 +667,11 @@
                 vec![
                     Ok::<&str, std::io::Error>(""), // Blank lines are ignored.
                     Ok("|multi_cfg_dep v0.1.0 (/private/tmp/ct)||"),
+                    Ok("|chrono v0.4.24|default,std|"),
                     Ok("|cpufeatures v0.2.1||"),
                     Ok("|libc v0.2.117|default,std|"),
                     Ok("|serde_derive v1.0.152 (proc-macro) (*)||"),
+                    Ok("|chrono v0.4.24|default,std,serde|"),
                 ]
                 .into_iter()
             )
@@ -700,6 +705,13 @@
                     },
                     BTreeSet::from([])
                 ),
+                (
+                    CrateId {
+                        name: "chrono".to_owned(),
+                        version: "0.4.24".to_owned()
+                    },
+                    BTreeSet::from(["default".to_owned(), "std".to_owned(), "serde".to_owned()])
+                ),
             ])
         );
     }
diff --git a/crate_universe/test_data/metadata/crate_combined_features/Cargo.lock b/crate_universe/test_data/metadata/crate_combined_features/Cargo.lock
new file mode 100644
index 0000000..3c6e874
--- /dev/null
+++ b/crate_universe/test_data/metadata/crate_combined_features/Cargo.lock
@@ -0,0 +1,376 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "assign"
+version = "1.1.1"
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+checksum = "5f093eed78becd229346bf859eec0aa4dd7ddde0757287b2b4107a1f09c80002"
+
+[[package]]
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+
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+ "serde",
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+ "serde",
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+ "once_cell",
+ "thiserror",
+ "toml",
+]
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+ "unicode-ident",
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+ "proc-macro2",
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+ "base64",
+ "bytes",
+ "form_urlencoded",
+ "indexmap",
+ "itoa",
+ "js_int",
+ "js_option",
+ "percent-encoding",
+ "ruma-identifiers-validation",
+ "ruma-macros",
+ "serde",
+ "serde_json",
+ "tracing",
+ "url",
+ "wildmatch",
+]
+
+[[package]]
+name = "ruma-identifiers-validation"
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+ "proc-macro-crate",
+ "proc-macro2",
+ "quote",
+ "ruma-identifiers-validation",
+ "syn 1.0.109",
+]
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+ "syn 2.0.3",
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+[[package]]
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+ "thiserror-impl",
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+ "proc-macro2",
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+ "syn 2.0.3",
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+checksum = "1f3ccbac311fea05f86f61904b462b55fb3df8837a366dfc601a0161d0532f20"
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+ "serde",
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+ "cfg-if",
+ "pin-project-lite",
+ "tracing-attributes",
+ "tracing-core",
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+
+[[package]]
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+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
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+checksum = "24eb03ba0eab1fd845050058ce5e616558e8f8d8fca633e6b163fe25c797213a"
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+ "once_cell",
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+
+[[package]]
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+
+[[package]]
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+checksum = "5c5713f0fc4b5db668a2ac63cdb7bb4469d8c9fed047b1d0292cc7b0ce2ba921"
+dependencies = [
+ "tinyvec",
+]
+
+[[package]]
+name = "url"
+version = "2.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0d68c799ae75762b8c3fe375feb6600ef5602c883c5d21eb51c09f22b83c4643"
+dependencies = [
+ "form_urlencoded",
+ "idna",
+ "percent-encoding",
+]
+
+[[package]]
+name = "wildmatch"
+version = "2.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ee583bdc5ff1cf9db20e9db5bb3ff4c3089a8f6b8b31aff265c9aba85812db86"
diff --git a/crate_universe/test_data/metadata/crate_combined_features/Cargo.toml b/crate_universe/test_data/metadata/crate_combined_features/Cargo.toml
new file mode 100644
index 0000000..53b9607
--- /dev/null
+++ b/crate_universe/test_data/metadata/crate_combined_features/Cargo.toml
@@ -0,0 +1,12 @@
+[package]
+name = "crate-combined-features"
+version = "0.1.0"
+edition = "2021" # make sure resolver=2 is enabled for this test
+
+# Required to satisfy cargo but no `lib.rs` is expected to
+# exist within test data.
+[lib]
+path = "lib.rs"
+
+[dependencies]
+ruma = "0.6"
diff --git a/crate_universe/tests/cargo_integration_test.rs b/crate_universe/tests/cargo_integration_test.rs
index b0a63f2..956f451 100644
--- a/crate_universe/tests/cargo_integration_test.rs
+++ b/crate_universe/tests/cargo_integration_test.rs
@@ -261,3 +261,37 @@
 
     assert!(!metadata["metadata"]["cargo-bazel"]["features"]["wgpu 0.14.0"].is_null());
 }
+
+#[test]
+fn feature_generator_crate_combined_features() {
+    // This test case requires network access to build pull crate metadata
+    // so that we can actually run `cargo tree`. However, RBE (and perhaps
+    // other environments) disallow or don't support this. In those cases,
+    // we just skip this test case.
+    use std::net::ToSocketAddrs;
+    if "github.com:443".to_socket_addrs().is_err() {
+        eprintln!("This test case requires network access. Skipping!");
+        return;
+    }
+
+    let runfiles = runfiles::Runfiles::create().unwrap();
+    let metadata = run(
+        "crate_combined_features",
+        HashMap::from([
+            (
+                runfiles
+                    .rlocation("rules_rust/crate_universe/test_data/metadata/crate_combined_features/Cargo.toml")
+                    .to_string_lossy()
+                    .to_string(),
+                "//:test_input".to_string(),
+            )
+        ]),
+        "rules_rust/crate_universe/test_data/metadata/crate_combined_features/Cargo.lock",
+    );
+
+    // serde appears twice in the list of dependencies, with and without derive features
+    assert_eq!(
+        metadata["metadata"]["cargo-bazel"]["features"]["serde 1.0.158"]["common"],
+        json!(["default", "derive", "serde_derive", "std"])
+    );
+}