diff --git a/src/support/Path.cpp b/src/support/Path.cpp
index 8b85471c97..fbf48d8d13 100644
--- a/src/support/Path.cpp
+++ b/src/support/Path.cpp
@@ -10,14 +10,12 @@
 
 #include <config.h>
 
-// Needed to prevent the definition of the unnamed_PathChanger macro
-// in the header file.
-
-#define PATHCHANGER_C
-
 #include "support/Path.h"
 #include "support/lyxlib.h"
 
+// undef PathChanger macro when building PathChanger
+#undef PathChanger
+
 
 namespace lyx {
 namespace support {
@@ -63,3 +61,7 @@ int PathChanger::pop()
 
 } // namespace support
 } // namespace lyx
+
+
+#define PathChanger(x) unnamed_PathChanger;
+// in merged builds this is not the last line.
diff --git a/src/support/Path.h b/src/support/Path.h
index 4c3d6ba1e8..d61a47a0f3 100644
--- a/src/support/Path.h
+++ b/src/support/Path.h
@@ -56,9 +56,7 @@ private:
 // PathChanger("/tmp");   // wrong
 // PathChanger p("/tmp");  // right
 // we add this macro:
-#ifndef PATHCHANGER_C
 #define PathChanger(x) unnamed_PathChanger;
-#endif
 // Tip gotten from Bobby Schmidt's column in C/C++ Users Journal
 
 } // namespace support