diff --git a/pkgs/development/libraries/libtommath/default.nix b/pkgs/development/libraries/libtommath/default.nix
index 15c392fa7923..a90377dad34a 100644
--- a/pkgs/development/libraries/libtommath/default.nix
+++ b/pkgs/development/libraries/libtommath/default.nix
@@ -12,7 +12,7 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ libtool ];
 
   postPatch = ''
-    substituteInPlace makefile.shared --replace "LT:=glibtool" "LT:=libtool"
+    substituteInPlace makefile.shared --replace glibtool libtool
     substituteInPlace makefile_include.mk --replace "shell arch" "shell uname -m"
   '';