diff --git a/pkgs/development/interpreters/guile/default.nix b/pkgs/development/interpreters/guile/default.nix
index c4634de5d3f2..bb0ef7594a4f 100644
--- a/pkgs/development/interpreters/guile/default.nix
+++ b/pkgs/development/interpreters/guile/default.nix
@@ -49,7 +49,7 @@
     sed -i "$out/lib/pkgconfig/guile-2.0.pc"    \
         -e 's|-lunistring|-L${libunistring}/lib -lunistring|g ;
             s|^Cflags:\(.*\)$|Cflags: -I${libunistring}/include \1|g ;
-            s|-lltdl|-L${libtool}/lib -lltdl|g'
+            s|-lltdl|-L${libtool.lib}/lib -lltdl|g'
   '';
 
   # make check doesn't work on darwin