diff --git a/netwerk/base/src/nsAuthURLParser.cpp b/netwerk/base/src/nsAuthURLParser.cpp
index 0f7bb39d6294..92a5e008a825 100644
--- a/netwerk/base/src/nsAuthURLParser.cpp
+++ b/netwerk/base/src/nsAuthURLParser.cpp
@@ -406,6 +406,13 @@ nsAuthURLParser::ParseAtDirectory(const char* i_Path, char* *o_Directory,
         if (file != dirfile)
         {
             ExtractString(dirfile, o_Directory, (file - dirfile)+1);
+            if (*dirfile != '/') {
+                nsCAutoString dir;
+                dir += "/" ;
+                dir += *o_Directory;
+                CRTFREEIF(*o_Directory);
+                *o_Directory = dir.ToNewCString();
+            }
         } else {
             DupString(o_Directory, "/");
         }
diff --git a/netwerk/base/src/nsNoAuthURLParser.cpp b/netwerk/base/src/nsNoAuthURLParser.cpp
index d4716b240e49..22d343450e22 100644
--- a/netwerk/base/src/nsNoAuthURLParser.cpp
+++ b/netwerk/base/src/nsNoAuthURLParser.cpp
@@ -248,6 +248,13 @@ nsNoAuthURLParser::ParseAtDirectory(const char* i_Path, char* *o_Directory,
         if (file != dirfile)
         {
             ExtractString(dirfile, o_Directory, (file - dirfile)+1);
+            if (*dirfile != '/') {
+                nsCAutoString dir;
+                dir += "/" ;
+                dir += *o_Directory;
+                CRTFREEIF(*o_Directory);
+                *o_Directory = dir.ToNewCString();
+            }
         } else {
             DupString(o_Directory, "/");
         }