diff --git a/src/main/java/picocli/CommandLine.java b/src/main/java/picocli/CommandLine.java
index 2e8a24877..feed90650 100644
--- a/src/main/java/picocli/CommandLine.java
+++ b/src/main/java/picocli/CommandLine.java
@@ -14158,7 +14158,7 @@ private int applyValueToSingleValuedField(ArgSpec argSpec,
                     // boolean option with arity = 0..1 or 0..*: value MAY be a param
                     boolean optionalWithBooleanValue = arity.max > 0 && ("true".equalsIgnoreCase(value) || "false".equalsIgnoreCase(value));
                     if (!optionalWithBooleanValue && lookBehind != LookBehind.ATTACHED_WITH_SEPARATOR) { // if attached, try converting the value to boolean (and fail if invalid value)
-                        Boolean defaultValue = booleanValue(argSpec, argSpec.calcDefaultValue(true)); // #712 flip the default value
+                        boolean defaultValue = booleanValue(argSpec, argSpec.calcDefaultValue(true)); // #712 flip the default value
                         if (argSpec.isOption() && !empty(((OptionSpec) argSpec).fallbackValue())) {
                             defaultValue = !booleanValue(argSpec, ((OptionSpec) argSpec).fallbackValue()); // #754 Allow boolean options to get value from fallback instead of defaultProvider
                         }