diff --git a/Source/RunResults.swift b/Source/RunResults.swift
index a3b0e87..d8c81c5 100644
--- a/Source/RunResults.swift
+++ b/Source/RunResults.swift
@@ -36,5 +36,5 @@ func splitCommandToArgs(_ command: String) -> [String] {
 
 func readPipe(_ pipe: TaskPipe) -> String {
     let data = pipe.read()
-    return NSString(data: data as Data, encoding: String.Encoding.utf8.rawValue) as? String ?? ""
+    return NSString(data: data as Data, encoding: String.Encoding.utf8.rawValue) as String? ?? ""
 }