diff --git a/src/args.ts b/src/args.ts
index d764cd9..3ad11e3 100644
--- a/src/args.ts
+++ b/src/args.ts
@@ -7,6 +7,7 @@ export function parseArgs(rawArgs: string[], argsDef: ArgsDef): ParsedArgs {
   const parseOptions = {
     boolean: [] as string[],
     string: [] as string[],
+    mixed: [] as string[],
     alias: {} as Record<string, string | string[]>,
     default: {} as Record<string, boolean | string>,
   };
@@ -17,7 +18,11 @@ export function parseArgs(rawArgs: string[], argsDef: ArgsDef): ParsedArgs {
     if (arg.type === "positional") {
       continue;
     }
-    parseOptions[arg.type || "boolean"].push(arg.name);
+    if (arg.type === "string") {
+      parseOptions.string.push(arg.name);
+    } else if (arg.type === "boolean") {
+      parseOptions.boolean.push(arg.name);
+    }
     if (arg.default !== undefined) {
       parseOptions.default[arg.name] = arg.default;
     }
diff --git a/src/types.ts b/src/types.ts
index 24974a6..8ea8e04 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -20,7 +20,7 @@ export type Arg = ArgDef & { name: string; alias: string[] };
 
 export type ParsedArgs<T extends ArgsDef = ArgsDef> = { _: string[] } & Record<
   { [K in keyof T]: T[K] extends { type: "positional" } ? K : never }[keyof T],
-  string | boolean
+  string
 > &
   Record<
     {
@@ -33,6 +33,12 @@ export type ParsedArgs<T extends ArgsDef = ArgsDef> = { _: string[] } & Record<
       [K in keyof T]: T[K] extends { type: "boolean" } ? K : never;
     }[keyof T],
     boolean
+  > &
+  Record<
+    {
+      [K in keyof T]: T[K] extends {} ? K : never;
+    }[keyof T],
+    string | boolean
   >;
 
 // ----- Command -----