diff --git a/Zip/Zip.swift b/Zip/Zip.swift
index c806b0d40c6a7e13f60b811aef5bb49b49cda644..deff9477dcb72ceb65ea0ccabe4471bd7084228e 100644
--- a/Zip/Zip.swift
+++ b/Zip/Zip.swift
@@ -192,7 +192,8 @@ public class Zip {
                 }
             }
 
-            fclose(filePointer)
+            if let fp = filePointer { fclose(fp) }
+
             crc_ret = unzCloseCurrentFile(zip)
             if crc_ret == UNZ_CRCERROR {
                 throw ZipError.unzipFail