diff --git a/src/base-commands/base-command.js b/src/base-commands/base-command.js
index 334c9c7e..8332d3d3 100644
--- a/src/base-commands/base-command.js
+++ b/src/base-commands/base-command.js
@@ -100,6 +100,11 @@ class BaseCommand extends Command {
 
     return limitedData;
   }
+
+  getPromptMessage(message) {
+    // Drop the trailing period and put a colon at the end of the message.
+    return message.trim().replace(/[.:]?$/, ':');
+  }
 }
 
 BaseCommand.flags = {
diff --git a/test/base-commands/base-command.test.js b/test/base-commands/base-command.test.js
index c040e5a0..bf9fd424 100644
--- a/test/base-commands/base-command.test.js
+++ b/test/base-commands/base-command.test.js
@@ -121,5 +121,13 @@ describe('base-commands', () => {
           expect(ctx.stdout).to.contain('FOO\tBAR\nfoo\tbar\n2\t2');
         });
     });
+
+    describe('getPromptMessage', () => {
+      baseCommandTest.it('adds a colon to the end of the message', ctx => {
+        expect(ctx.testCmd.getPromptMessage('Name: ')).to.equal('Name:');
+        expect(ctx.testCmd.getPromptMessage('Number.')).to.equal('Number:');
+        expect(ctx.testCmd.getPromptMessage('  Address  ')).to.equal('Address:');
+      });
+    });
   });
 });