diff --git a/test/default/cmptest.h b/test/default/cmptest.h
index 156640c2..f9f93d68 100644
--- a/test/default/cmptest.h
+++ b/test/default/cmptest.h
@@ -10,6 +10,10 @@
 
 #include "sodium.h"
 
+#ifdef __EMSCRIPTEN__
+# undef TEST_SRCDIR
+# define TEST_SRCDIR "/test-data"
+#endif
 #ifndef TEST_SRCDIR
 # define TEST_SRCDIR "."
 #endif
diff --git a/test/default/pre.js b/test/default/pre.js
index 1a713aee..51d94d44 100644
--- a/test/default/pre.js
+++ b/test/default/pre.js
@@ -28,10 +28,12 @@ Module['preRun'].push(function(){
         }
     }
     FS.init();
+    FS.mkdir('/test-data');
+    FS.mount(NODEFS,  { root: '.' }, '/test');
     FS.analyzePath('/dev/random').exists && FS.unlink('/dev/random');
     FS.analyzePath('/dev/urandom') && FS.unlink('/dev/urandom');
     var devFolder = FS.findObject('/dev') ||
         Module['FS_createFolder']('/', 'dev', true, true);
     Module['FS_createDevice'](devFolder, 'random', randombyte);
-    Module['FS_createDevice'](devFolder, 'urandom', randombyte);    
+    Module['FS_createDevice'](devFolder, 'urandom', randombyte);
 });