diff --git a/src/install/lockfile/Package.zig b/src/install/lockfile/Package.zig
index cb2c40e7088..790045fa3b3 100644
--- a/src/install/lockfile/Package.zig
+++ b/src/install/lockfile/Package.zig
@@ -1318,13 +1318,15 @@ pub fn Package(comptime SemverIntType: type) type {
                 }
             }
 
-            if (json.asProperty("patchedDependencies")) |patched_deps| {
-                const obj = patched_deps.expr.data.e_object;
-                for (obj.properties.slice()) |prop| {
-                    const key = prop.key.?;
-                    const value = prop.value.?;
-                    if (key.isString() and value.isString()) {
-                        string_builder.count(value.asString(allocator).?);
+            if (comptime features.patched_dependencies) {
+                if (json.asProperty("patchedDependencies")) |patched_deps| {
+                    const obj = patched_deps.expr.data.e_object;
+                    for (obj.properties.slice()) |prop| {
+                        const key = prop.key.?;
+                        const value = prop.value.?;
+                        if (key.isString() and value.isString()) {
+                            string_builder.count(value.asString(allocator).?);
+                        }
                     }
                 }
             }
@@ -1648,17 +1650,19 @@ pub fn Package(comptime SemverIntType: type) type {
                 };
             }
 
-            if (json.asProperty("patchedDependencies")) |patched_deps| {
-                const obj = patched_deps.expr.data.e_object;
-                lockfile.patched_dependencies.ensureTotalCapacity(allocator, obj.properties.len) catch unreachable;
-                for (obj.properties.slice()) |prop| {
-                    const key = prop.key.?;
-                    const value = prop.value.?;
-                    if (key.isString() and value.isString()) {
-                        var sfb = std.heap.stackFallback(1024, allocator);
-                        const keyhash = try key.asStringHash(sfb.get(), String.Builder.stringHash) orelse unreachable;
-                        const patch_path = string_builder.append(String, value.asString(allocator).?);
-                        lockfile.patched_dependencies.put(allocator, keyhash, .{ .path = patch_path }) catch unreachable;
+            if (comptime features.patched_dependencies) {
+                if (json.asProperty("patchedDependencies")) |patched_deps| {
+                    const obj = patched_deps.expr.data.e_object;
+                    lockfile.patched_dependencies.ensureTotalCapacity(allocator, obj.properties.len) catch unreachable;
+                    for (obj.properties.slice()) |prop| {
+                        const key = prop.key.?;
+                        const value = prop.value.?;
+                        if (key.isString() and value.isString()) {
+                            var sfb = std.heap.stackFallback(1024, allocator);
+                            const keyhash = try key.asStringHash(sfb.get(), String.Builder.stringHash) orelse unreachable;
+                            const patch_path = string_builder.append(String, value.asString(allocator).?);
+                            lockfile.patched_dependencies.put(allocator, keyhash, .{ .path = patch_path }) catch unreachable;
+                        }
                     }
                 }
             }
diff --git a/test/cli/install/bun-install-patch.test.ts b/test/cli/install/bun-install-patch.test.ts
index d954564983a..65623168a4d 100644
--- a/test/cli/install/bun-install-patch.test.ts
+++ b/test/cli/install/bun-install-patch.test.ts
@@ -572,6 +572,108 @@ index 832d92223a9ec491364ee10dcbe3ad495446ab80..7e079a817825de4b8c3d01898490dc7e
     }
   });
 
+  // https://github.com/oven-sh/bun/issues/13531
+  it("should ignore patchedDependencies from a folder dependency's package.json", async () => {
+    const patchFilename = filepathEscape("is-even@1.0.0.patch");
+    const filedir = tempDirWithFiles("patch-folder-dep", {
+      "pkgA": {
+        "package.json": JSON.stringify({
+          "name": "pkg-a",
+          "version": "1.0.0",
+          "patchedDependencies": {
+            "is-even@1.0.0": `patches/${patchFilename}`,
+          },
+          "dependencies": {
+            "is-even": "1.0.0",
+          },
+        }),
+        "patches": {
+          [patchFilename]: is_even_patch,
+        },
+      },
+      "pkgB": {
+        "package.json": JSON.stringify({
+          "name": "pkg-b",
+          "version": "1.0.0",
+          "dependencies": {
+            "pkg-a": "../pkgA",
+          },
+        }),
+      },
+    });
+
+    await using proc = Bun.spawn({
+      cmd: [bunExe(), "install"],
+      env: bunEnv,
+      cwd: join(filedir, "pkgB"),
+      stdout: "pipe",
+      stderr: "pipe",
+    });
+
+    const [stdout, stderr, exitCode] = await Promise.all([proc.stdout.text(), proc.stderr.text(), proc.exited]);
+
+    // patchedDependencies from pkgA should be ignored, not resolved relative to pkgB
+    expect(stderr).not.toContain("Couldn't find patch file");
+    expect(stderr).not.toContain("patches/");
+    expect({ stdout, exitCode }).toMatchObject({ exitCode: 0 });
+
+    // lockfile should not contain pkgA's patchedDependencies
+    const lockfile = await Bun.file(join(filedir, "pkgB", "bun.lock")).text();
+    expect(lockfile).toContain("pkg-a");
+    expect(lockfile).not.toContain("patchedDependencies");
+  });
+
+  // https://github.com/oven-sh/bun/issues/13531 (workspace variant, see also #27894)
+  it("should ignore patchedDependencies from a workspace member's package.json", async () => {
+    // Only the install root's `patchedDependencies` is honored (matching
+    // `overrides`, `workspaces`, and `catalogs` behavior). Previously the
+    // member's patch paths were written to the root lockfile and resolved
+    // relative to the root directory, failing with "Couldn't find patch file".
+    const patchFilename = filepathEscape("is-even@1.0.0.patch");
+    const filedir = tempDirWithFiles("patch-workspace-member", {
+      "package.json": JSON.stringify({
+        name: "workspace-root",
+        workspaces: ["packages/*"],
+      }),
+      packages: {
+        lib: {
+          "package.json": JSON.stringify({
+            name: "lib",
+            dependencies: {
+              "is-even": "1.0.0",
+            },
+            // This only applies when `lib` itself is the install root.
+            patchedDependencies: {
+              "is-even@1.0.0": `patches/${patchFilename}`,
+            },
+          }),
+          patches: {
+            [patchFilename]: is_even_patch,
+          },
+        },
+      },
+    });
+
+    await using proc = Bun.spawn({
+      cmd: [bunExe(), "install"],
+      env: bunEnv,
+      cwd: filedir,
+      stdout: "pipe",
+      stderr: "pipe",
+    });
+
+    const [stdout, stderr, exitCode] = await Promise.all([proc.stdout.text(), proc.stderr.text(), proc.exited]);
+
+    expect(stderr).not.toContain("Couldn't find patch file");
+    expect(stderr).not.toContain("patches/");
+    expect({ stdout, exitCode }).toMatchObject({ exitCode: 0 });
+
+    // The member's patchedDependencies did not leak into the root lockfile.
+    const lockfile = await Bun.file(join(filedir, "bun.lock")).text();
+    expect(lockfile).not.toContain("patchedDependencies");
+    expect(lockfile).toContain("is-even");
+  });
+
   describe("bun patch with --linker=isolated", () => {
     const patchEnv = bunEnv;