diff --git a/pkgs/applications/misc/abook/default.nix b/pkgs/applications/misc/abook/default.nix
index 77e48e49dd8..b8e662a42cd 100644
--- a/pkgs/applications/misc/abook/default.nix
+++ b/pkgs/applications/misc/abook/default.nix
@@ -11,6 +11,11 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ pkgconfig ncurses readline ];
 
+  # Changed inline semantics in GCC5, need to export symbols for inline funcs
+  postPatch = ''
+    substituteInPlace database.c --replace inline extern
+  '';
+
   meta = {
     homepage = "http://abook.sourceforge.net/";
     description = "Text-based addressbook program designed to use with mutt mail client";