diff --git a/src/libmain/shared.cc b/src/libmain/shared.cc
index 1987050dd5..c153a6fafc 100644
--- a/src/libmain/shared.cc
+++ b/src/libmain/shared.cc
@@ -16,9 +16,7 @@
 #include <pwd.h>
 #include <grp.h>
 
-extern "C" {
 #include <aterm2.h>
-}
 
 
 namespace nix {
diff --git a/src/libutil/aterm.hh b/src/libutil/aterm.hh
index 431c67d130..6a2415f0b7 100644
--- a/src/libutil/aterm.hh
+++ b/src/libutil/aterm.hh
@@ -1,9 +1,7 @@
 #ifndef __ATERM_H
 #define __ATERM_H
 
-extern "C" {
 #include <aterm2.h>
-}
 
 #include "types.hh"