diff --git a/pkgs/applications/networking/newsreaders/slrn/default.nix b/pkgs/applications/networking/newsreaders/slrn/default.nix
index d5605e39db7..f29493beb00 100644
--- a/pkgs/applications/networking/newsreaders/slrn/default.nix
+++ b/pkgs/applications/networking/newsreaders/slrn/default.nix
@@ -18,7 +18,7 @@ stdenv.mkDerivation {
       -e "s|/bin/rm|rm|"
   '';
 
-  configureFlags = "--with-slang=${slang} --with-ssl=${openssl.dev}";
+  configureFlags = "--with-slang=${slang.dev} --with-ssl=${openssl.dev}";
 
   buildInputs = [ slang ncurses openssl ];
 
diff --git a/pkgs/tools/misc/most/default.nix b/pkgs/tools/misc/most/default.nix
index b97d8f0b719..1c1def9b8a8 100644
--- a/pkgs/tools/misc/most/default.nix
+++ b/pkgs/tools/misc/most/default.nix
@@ -15,7 +15,7 @@ stdenv.mkDerivation {
       -e "s|/bin/rm|rm|"
   '';
   
-  configureFlags = "--with-slang=${slang}";
+  configureFlags = "--with-slang=${slang.dev}";
 
   buildInputs = [ slang ncurses ];