diff --git a/Zip/Zip.swift b/Zip/Zip.swift
index 544e30082e22b604d0a4d34ae9e0f75441dd8eba..44d034e8d96d5382a425468a2593bd38e3e1580d 100644
--- a/Zip/Zip.swift
+++ b/Zip/Zip.swift
@@ -199,7 +199,8 @@ public class Zip {
                 }
             }
 
-            fclose(filePointer)
+            if let fp = filePointer { fclose(fp) }
+
             crc_ret = unzCloseCurrentFile(zip)
             if crc_ret == UNZ_CRCERROR {
                 throw ZipError.unzipFail