diff --git a/lib/pact_broker/client/cli/matrix_commands.rb b/lib/pact_broker/client/cli/matrix_commands.rb
index a8b5c1d..f4a7cd0 100644
--- a/lib/pact_broker/client/cli/matrix_commands.rb
+++ b/lib/pact_broker/client/cli/matrix_commands.rb
@@ -31,6 +31,7 @@ def can_i_deploy(*ignored_but_necessary)
               selectors = VersionSelectorOptionsParser.call(ARGV).select { |s| !s[:ignore] }
               ignore_selectors = VersionSelectorOptionsParser.call(ARGV).select { |s| s[:ignore] } + ignore_selectors_from_environment_variable
               validate_can_i_deploy_selectors(selectors)
+              validate_can_i_deploy_options
               dry_run = options.dry_run || ENV["PACT_BROKER_CAN_I_DEPLOY_DRY_RUN"] == "true"
               can_i_deploy_options = { output: options.output, retry_while_unknown: options.retry_while_unknown, retry_interval: options.retry_interval, dry_run: dry_run, verbose: options.verbose }
               result = CanIDeploy.call(selectors, { to_tag: options.to, to_environment: options.to_environment, limit: options.limit, ignore_selectors: ignore_selectors }, can_i_deploy_options, pact_broker_client_options)
@@ -82,6 +83,12 @@ def validate_can_i_deploy_selectors selectors
                 raise ::Thor::RequiredArgumentMissingError, "The version must be specified using `--version VERSION`, `--branch BRANCH` `--latest`, `--latest TAG`, or `--all TAG` for pacticipant #{pacticipants_without_versions.join(", ")}" if pacticipants_without_versions.any?
               end
 
+              def validate_can_i_deploy_options
+                if options[:to_environment] && options[:to_environment].blank?
+                  raise ::Thor::RequiredArgumentMissingError, "The environment name cannot be blank"
+                end
+              end
+
               def ignore_selectors_from_environment_variable
                 ENV.fetch("PACT_BROKER_CAN_I_DEPLOY_IGNORE", "").split(",").collect(&:strip).collect{ |i| { pacticipant: i } }
               end
diff --git a/spec/lib/pact_broker/client/cli/broker_can_i_deploy_spec.rb b/spec/lib/pact_broker/client/cli/broker_can_i_deploy_spec.rb
index a89e251..3f4ef32 100644
--- a/spec/lib/pact_broker/client/cli/broker_can_i_deploy_spec.rb
+++ b/spec/lib/pact_broker/client/cli/broker_can_i_deploy_spec.rb
@@ -70,6 +70,16 @@ module CLI
             expect(CanIDeploy).to receive(:call).with(anything, {to_tag: nil, to_environment: 'prod', limit: 1000, ignore_selectors: []}, anything, anything)
             invoke_can_i_deploy
           end
+
+          context "when the environment is an empty string" do
+            before do
+              subject.options.to_environment = ' '
+            end
+
+            it "raises an error" do
+              expect { invoke_can_i_deploy }.to raise_error ::Thor::RequiredArgumentMissingError
+            end
+          end
         end
 
         context "with basic auth" do