diff --git a/src/tl/tl/tlStream.cc b/src/tl/tl/tlStream.cc
index dc57b3a98..dc1425537 100644
--- a/src/tl/tl/tlStream.cc
+++ b/src/tl/tl/tlStream.cc
@@ -1334,11 +1334,11 @@ OutputPipe::write (const char *b, size_t n)
 // ---------------------------------------------------------------
 //  InputPipe delegate implementation
 
-InputPipe::InputPipe (const std::string &path)
+InputPipe::InputPipe (const std::string &source)
   : m_file (NULL)
 {
-  m_source = path;
-  m_file = popen (tl::string_to_system (path).c_str (), "r");
+  m_source = source;
+  m_file = popen (tl::string_to_system (source).c_str (), "r");
   if (m_file == NULL) {
     throw FilePOpenErrorException (m_source, errno);
   }
diff --git a/src/tl/tl/tlStream.h b/src/tl/tl/tlStream.h
index 2412c4663..087e54f45 100644
--- a/src/tl/tl/tlStream.h
+++ b/src/tl/tl/tlStream.h
@@ -313,7 +313,7 @@ public:
    *  @param cmd The command to execute
    *  @param read True, if the file should be read, false on write.
    */
-  InputPipe (const std::string &path);
+  InputPipe (const std::string &source);
 
   /**
    *  @brief Close the pipe
@@ -348,8 +348,7 @@ public:
    */
   virtual std::string source () const
   {
-    //  No source (in the sense of a file name) is available ..
-    return std::string ();
+    return m_source;
   }
 
   virtual std::string absolute_path () const