diff --git a/src/main/java/picocli/CommandLine.java b/src/main/java/picocli/CommandLine.java
index 7985f4d22..57bff4913 100644
--- a/src/main/java/picocli/CommandLine.java
+++ b/src/main/java/picocli/CommandLine.java
@@ -5995,13 +5995,13 @@ private Model() {}
          * @since 4.0
          */
         public interface IScope extends IGetter, ISetter {}
-        
-        /** This interface provides access to an {@link IScope} instance. 
+
+        /** This interface provides access to an {@link IScope} instance.
          * @since 4.7
          */
         public interface IScoped {
             /** Get the {@link IScope} instance.
-             * 
+             *
              *  @return {@link IScope} instance */
             IScope getScope();
         }
@@ -9176,8 +9176,8 @@ private String defaultValueFromProvider() {
              * @return whether this argument applies to all descendent subcommands of the command where it is defined
              * @since 4.3 */
             public ScopeType scopeType() { return scopeType; }
-            
-            /** Check whether the {@link #getValue()} method is able to get an actual value from the current {@link #getter()}. 
+
+            /** Check whether the {@link #getValue()} method is able to get an actual value from the current {@link #getter()}.
              * @since 4.7 */
             public boolean isValueGettable() {
                 if (getter instanceof IScoped) {
@@ -15754,14 +15754,17 @@ static Text concatOptionText(String prefix, Text text, Help.ColorScheme colorSch
                 Text name = colorScheme.optionText(nameString);
                 Text param = parameterLabelRenderer.renderParameterLabel(option, colorScheme.ansi(), colorScheme.optionParamStyles);
                 text = text.concat(prefix);
+
+                // related: Interpreter#getActualTypeConverter special logic for interactive char[] options... (also: #648)
+                boolean treatAsSingleValue = char[].class.equals(option.type()) && option.interactive(); // #1834
                 if (option.required()) { // e.g., -x=VAL
                     text = text.concat(name).concat(param).concat("");
-                    if (option.isMultiValue()) { // e.g., -x=VAL [-x=VAL]...
+                    if (option.isMultiValue() && !treatAsSingleValue) { // e.g., -x=VAL [-x=VAL]...
                         text = text.concat(" [").concat(name).concat(param).concat("]...");
                     }
                 } else {
                     text = text.concat("[").concat(name).concat(param).concat("]");
-                    if (option.isMultiValue()) { // add ellipsis to show option is repeatable
+                    if (option.isMultiValue() && !treatAsSingleValue) { // add ellipsis to show option is repeatable
                         text = text.concat("...");
                     }
                 }
diff --git a/src/test/java/picocli/HelpTest.java b/src/test/java/picocli/HelpTest.java
index 9c7f8c8d7..3baeb2ff3 100644
--- a/src/test/java/picocli/HelpTest.java
+++ b/src/test/java/picocli/HelpTest.java
@@ -5180,4 +5180,14 @@ public Text[][] render(OptionSpec option, IParamLabelRenderer ignored, ColorSche
         String actual = cmd.getUsageMessage();
         assertEquals(expected, actual);
     }
+
+    @Test
+    public void testIssue1834SynopsisForCharArrayOption() {
+        @Command() class App {
+            @Option(names = {"--password", "-p"}, interactive = true, echo = false, arity = "0..1", required = true)
+            private char[] password;;
+        }
+        Help help = new Help(new App());
+        assertEquals("<main class> -p[=<password>]" + LINESEP, help.synopsis(0));
+    }
 }