diff --git a/src/main/java/net/minecraftforge/installer/SimpleInstaller.java b/src/main/java/net/minecraftforge/installer/SimpleInstaller.java
index 7ad95e7..fdf4431 100644
--- a/src/main/java/net/minecraftforge/installer/SimpleInstaller.java
+++ b/src/main/java/net/minecraftforge/installer/SimpleInstaller.java
@@ -36,6 +36,7 @@
 public class SimpleInstaller {
     public static boolean headless = false;
     public static boolean debug = false;
+    public static boolean skipHashCheck = false;
     public static URL mirror = null;
 
     public static void main(String[] args) throws IOException, URISyntaxException {
@@ -73,6 +74,7 @@ public static void main(String[] args) throws IOException, URISyntaxException {
         OptionSpec<Void> helpOption = parser.acceptsAll(Arrays.asList("h", "help"),"Help with this installer");
         OptionSpec<Void> offlineOption = parser.accepts("offline", "Don't attempt any network calls");
         OptionSpec<Void> debugOption = parser.accepts("debug", "Run in debug mode -- don't delete any files");
+        OptionSpec<Void> skipHashCheckOption = parser.accepts("skipHashCheck", "skips the hash check when verifing outputs");
         OptionSpec<URL> mirrorOption = parser.accepts("mirror", "Use a specific mirror URL").withRequiredArg().ofType(URL.class);
         OptionSet optionSet = parser.parse(args);
 
@@ -84,6 +86,7 @@ public static void main(String[] args) throws IOException, URISyntaxException {
         debug = optionSet.has(debugOption);
         if (optionSet.has(mirrorOption))
             mirror = optionSet.valueOf(mirrorOption);
+        skipHashCheck = optionSet.has(skipHashCheckOption);
 
         String badCerts = "";
         if (optionSet.has(offlineOption) || SimpleInstaller.class.getResource("/" + OfflineAction.OFFLINE_FLAG) != null) {
diff --git a/src/main/java/net/minecraftforge/installer/actions/PostProcessors.java b/src/main/java/net/minecraftforge/installer/actions/PostProcessors.java
index 99040a6..6bdd286 100644
--- a/src/main/java/net/minecraftforge/installer/actions/PostProcessors.java
+++ b/src/main/java/net/minecraftforge/installer/actions/PostProcessors.java
@@ -234,7 +234,7 @@ public Set<File> process(File librariesDir, File minecraft, File root, File inst
                         ret.add(output.file);
                         if (!output.file.exists()) {
                             err.append("\n    ").append(output.file).append(" missing");
-                        } else {
+                        } else if (!SimpleInstaller.skipHashCheck) {
                             String sha = DownloadUtils.getSha1(output.file);
                             if (sha.equals(output.sha1)) {
                                 log("  Output: " + output.file + " Checksum Validated: " + sha);