diff --git a/src/common/DispatchTimeIntervalToSeconds.swift b/src/common/DispatchTimeIntervalToSeconds.swift
index f5bf24f..2cce522 100644
--- a/src/common/DispatchTimeIntervalToSeconds.swift
+++ b/src/common/DispatchTimeIntervalToSeconds.swift
@@ -15,6 +15,7 @@
  */
 
 import Foundation
+import CoreGraphics
 
 extension DispatchTimeInterval {
   func toSeconds() -> CGFloat {
diff --git a/src/operators/visualize.swift b/src/operators/visualize.swift
index 39936a5..835cdce 100644
--- a/src/operators/visualize.swift
+++ b/src/operators/visualize.swift
@@ -15,6 +15,7 @@
  */
 
 import Foundation
+import UIKit
 
 extension MotionObservableConvertible {