diff --git a/pkgs/applications/science/math/pcalc/default.nix b/pkgs/applications/science/math/pcalc/default.nix
index 167ab9275fa..51c93f197e4 100644
--- a/pkgs/applications/science/math/pcalc/default.nix
+++ b/pkgs/applications/science/math/pcalc/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchgit, bison2, flex }:
+{ stdenv, fetchgit, bison, flex }:
 
 with stdenv.lib;
 
@@ -13,7 +13,7 @@ stdenv.mkDerivation rec {
   };
 
   makeFlags = [ "DESTDIR= BINDIR=$(out)/bin" ];
-  buildInputs = [ bison2 flex ];
+  buildInputs = [ bison flex ];
 
   meta = {
     homepage = http://pcalc.sourceforge.net/;