diff --git a/samtools.wdl b/samtools.wdl
index ecff136925c9640cd196883a870549296379788f..5bb6d09da2a5ce0484ab776475bdb09e0a7fa2d6 100644
--- a/samtools.wdl
+++ b/samtools.wdl
@@ -122,7 +122,7 @@ task view {
     String? preCommand
     File inFile
     File? referenceFasta
-    String? outputFileName
+    String outputFileName
     Boolean? outputBam
     Boolean? uncompressedBamOutput
     Int? includeFilter
@@ -144,4 +144,8 @@ task view {
     ${"--threads " + threads - 1} \
     ${inFile}
     }
+
+    output {
+        File outputFile = outputFileName
+    }
 }