diff --git a/src/common/DispatchTimeIntervalToSeconds.swift b/src/common/DispatchTimeIntervalToSeconds.swift
index 63f4c65..f5bf24f 100644
--- a/src/common/DispatchTimeIntervalToSeconds.swift
+++ b/src/common/DispatchTimeIntervalToSeconds.swift
@@ -14,6 +14,8 @@
  limitations under the License.
  */
 
+import Foundation
+
 extension DispatchTimeInterval {
   func toSeconds() -> CGFloat {
     let seconds: CGFloat