diff --git a/lib/cocaine/command_line.rb b/lib/cocaine/command_line.rb
index 25bcc37..330d850 100644
--- a/lib/cocaine/command_line.rb
+++ b/lib/cocaine/command_line.rb
@@ -125,7 +125,11 @@ def interpolate(pattern, interpolations)
       interpolations = stringify_keys(interpolations)
       pattern.gsub(/:\{?(\w+)\b\}?/) do |match|
         key = match.tr(":{}", "")
-        interpolations.key?(key) ? shell_quote(interpolations[key]) : match
+        if interpolations.key?(key)
+          Array(interpolations[key]).map { |value| shell_quote(value) }.join(" ")
+        else
+          match
+        end
       end
     end
 
diff --git a/spec/cocaine/command_line_spec.rb b/spec/cocaine/command_line_spec.rb
index 1e9a2cd..7bcacbd 100644
--- a/spec/cocaine/command_line_spec.rb
+++ b/spec/cocaine/command_line_spec.rb
@@ -78,6 +78,11 @@
     command.run(:hello_world => "Hello, world").should match(/Hello, world/)
   end
 
+  it "interpolates any Array arguments when running a command" do
+    command = Cocaine::CommandLine.new("echo", "Hello :worlds and :dwarfs")
+    command.command(:worlds => %w[mercury venus earth], :dwarfs => "pluto").should == "echo Hello 'mercury' 'venus' 'earth' and 'pluto'"
+  end
+
   it "quotes command line options differently if we're on windows" do
     on_windows!
     cmd = Cocaine::CommandLine.new("convert",