diff --git a/pkgs/development/libraries/libpcap/default.nix b/pkgs/development/libraries/libpcap/default.nix
index b560ad05c37..324615500fe 100644
--- a/pkgs/development/libraries/libpcap/default.nix
+++ b/pkgs/development/libraries/libpcap/default.nix
@@ -1,13 +1,13 @@
 {stdenv, fetchurl, flex, bison}:
 
 stdenv.mkDerivation rec {
-  name = "libpcap-0.9.8";
+  name = "libpcap-0.9.4";
   src = fetchurl {
       url = [
        "mirror://tcpdump/release/${name}.tar.gz"
        "http://www.sfr-fresh.com/unix/misc/${name}.tar.gz"
       ];
-      sha256 = "1yb2hg8jd1bzq3lbrff1sps4757krvj2c9pm2ixn44a4vsc865f4";
+      sha256 = "0q0cnn607kfa4y4rbz3glg5lfr8r08s8l08w8fwrr3d6njjzd71p";
   };
   buildInputs = [flex bison];
   configureFlags = "
diff --git a/pkgs/tools/networking/tcpdump/default.nix b/pkgs/tools/networking/tcpdump/default.nix
index 8b0a7fb22d2..0b1937e76af 100644
--- a/pkgs/tools/networking/tcpdump/default.nix
+++ b/pkgs/tools/networking/tcpdump/default.nix
@@ -1,11 +1,11 @@
 {stdenv, fetchurl, libpcap}:
 
 stdenv.mkDerivation rec {
-  name = "tcpdump-3.9.8";
+  name = "tcpdump-3.9.4";
 
   src = fetchurl {
     url = "mirror://tcpdump/release/${name}.tar.gz";
-    sha256 = "16fjm1ih56mwqniffp63adbxwfj5n10x1a7l22j3cx683pmwh293";
+    sha256 = "1dbknf6ys7n3mmlb6klr0jh0jgnnq3zd9y44kjdxcbmbdjhp1rvy";
   };
 
   buildInputs = [libpcap];