diff --git a/pkgs/servers/nosql/cassandra/2.0.nix b/pkgs/servers/nosql/cassandra/2.0.nix
index e3ed35241fa..a4aca1c55c1 100644
--- a/pkgs/servers/nosql/cassandra/2.0.nix
+++ b/pkgs/servers/nosql/cassandra/2.0.nix
@@ -6,6 +6,7 @@
 , gawk
 , bash
 , getopt
+, procps
 }:
 
 let
@@ -34,7 +35,8 @@ stdenv.mkDerivation rec {
         --set JAVA_HOME ${jre} \
         --prefix PATH : ${bash}/bin \
         --prefix PATH : ${getopt}/bin \
-        --prefix PATH : ${gawk}/bin
+        --prefix PATH : ${gawk}/bin \
+        --prefix PATH : ${procps}/bin
     done
 
     wrapProgram $out/bin/cqlsh --prefix PATH : ${python}/bin
diff --git a/pkgs/servers/nosql/cassandra/2.1.nix b/pkgs/servers/nosql/cassandra/2.1.nix
index 2f8cb84117a..f82daee7b14 100644
--- a/pkgs/servers/nosql/cassandra/2.1.nix
+++ b/pkgs/servers/nosql/cassandra/2.1.nix
@@ -6,6 +6,7 @@
 , gawk
 , bash
 , getopt
+, procps
 }:
 
 let
@@ -34,7 +35,8 @@ stdenv.mkDerivation rec {
         --set JAVA_HOME ${jre} \
         --prefix PATH : ${bash}/bin \
         --prefix PATH : ${getopt}/bin \
-        --prefix PATH : ${gawk}/bin
+        --prefix PATH : ${gawk}/bin \
+        --prefix PATH : ${procps}/bin
     done
 
     wrapProgram $out/bin/cqlsh --prefix PATH : ${python}/bin