diff --git a/Sources/Extensions/Sequence/Sequence+ConcurrentMap.swift b/Sources/Extensions/Sequence/Sequence+ConcurrentMap.swift
index 71843141..773990f2 100644
--- a/Sources/Extensions/Sequence/Sequence+ConcurrentMap.swift
+++ b/Sources/Extensions/Sequence/Sequence+ConcurrentMap.swift
@@ -55,7 +55,7 @@ public extension Sequence {
         return Observable.from(indexedRanges)
             .flatMap { indexedRange -> Observable<(idx: Int, results: [R])> in
                 Observable.just(indexedRange)
-                    .observeOn(scheduler)
+                    .observe(on: scheduler)
                     .map { (idx: $0.idx, results: try array[$0.range].map(transform)) }
             }
             .toArray()
diff --git a/Sources/Extensions/UIColor/UIColor+Hex.swift b/Sources/Extensions/UIColor/UIColor+Hex.swift
index 42eea8b8..e313578c 100644
--- a/Sources/Extensions/UIColor/UIColor+Hex.swift
+++ b/Sources/Extensions/UIColor/UIColor+Hex.swift
@@ -138,9 +138,13 @@ public extension UIColor {
 
         getRed(&red, green: &green, blue: &blue, alpha: &alpha)
 
-        let intRepresentation = alpha == 1
-            ? Int(red * 255) << 16 | Int(green * 255) << 8 | Int(blue * 255) << 0
-            : Int(red * 255) << 24 | Int(green * 255) << 16 | Int(blue * 255) << 8 | Int(alpha * 255) << 0
+        let intRepresentation: Int
+
+        if alpha == 1 {
+            intRepresentation = Int(red * 255) << 16 | Int(green * 255) << 8 | Int(blue * 255)
+        } else {
+            intRepresentation = Int(red * 255) << 24 | Int(green * 255) << 16 | Int(blue * 255) << 8 | Int(alpha * 255)
+        }
 
         return String(intRepresentation, radix: 16)
     }