diff --git a/lib/diss.js b/lib/diss.js
index fa69e33..e401364 100644
--- a/lib/diss.js
+++ b/lib/diss.js
@@ -61,7 +61,7 @@ function dissProvider() {
         //
         // Loads all dependencies from given module. Usually you should call it with `require.main`
         //
-        Object.keys(pkg.dependencies || {}).forEach( name => requireWrapper(name, main || require.main) );
+        Object.keys(pkg.dependencies || {}).forEach( function( name ) { return requireWrapper(name, main || require.main); }  );
         return diss;
     }
     
@@ -70,7 +70,7 @@ function dissProvider() {
         // Loads providers for given module.
         //
         const from = main || require.main;
-        providers.forEach( name => diss.register.provider(name, from.require( (directory || ".") + '/' + name)) )
+        providers.forEach( function( name ) { return diss.register.provider(name, from.require( (directory || ".") + '/' + name)) } )
     }
 
     function registerProvider(name, provider) {
@@ -107,7 +107,7 @@ function dissProvider() {
         if (argstring !== '') {
             deps = argstring.split(',')
                 .map(resolveOrGetAlreadyResolved)
-                .map(envelope => envelope.module);
+                .map(function(envelope) { return envelope.module } );
         } else {    // if there was attempt to resolve and no module, dependency is circual
             deps = [];
         }