diff --git a/Package.swift b/Package.swift
index 51473e56357..ea6c6d2fe9d 100644
--- a/Package.swift
+++ b/Package.swift
@@ -259,7 +259,7 @@ import Darwin.C
 
 if getenv("SWIFTPM_BOOTSTRAP") == nil {
     package.dependencies += [
-        .package(url: "https://github.com/apple/swift-llbuild.git", .branch("master")),
+        .package(url: "https://github.com/apple/swift-llbuild.git", "0.1.0"..<"0.2.0"),
     ]
     package.targets.first(where: { $0.name == "SPMLLBuild" })!.dependencies += ["llbuildSwift"]
 }
diff --git a/Sources/Basic/SortedArray.swift b/Sources/Basic/SortedArray.swift
index 045c1e017c4..72a2144e12d 100644
--- a/Sources/Basic/SortedArray.swift
+++ b/Sources/Basic/SortedArray.swift
@@ -69,7 +69,7 @@ public struct SortedArray<Element>: CustomStringConvertible {
     
     /// Insert the given sequence, maintaining the sort order.
     public mutating func insert<S: Sequence>(contentsOf newElements: S) where S.Iterator.Element == Element {
-        var newElements: Array = newElements.sorted(by: areInIncreasingOrder)
+        let newElements: Array = newElements.sorted(by: areInIncreasingOrder)
         guard !newElements.isEmpty else {
             return
         }