diff --git a/packages/xpath/src/evaluator/functions/FunctionImplementation.ts b/packages/xpath/src/evaluator/functions/FunctionImplementation.ts
index 9017192e7..edda22441 100644
--- a/packages/xpath/src/evaluator/functions/FunctionImplementation.ts
+++ b/packages/xpath/src/evaluator/functions/FunctionImplementation.ts
@@ -39,7 +39,7 @@ export class InvalidArgumentError extends Error {
 	}
 }
 
-export type ParameterArityType = 'optional' | 'required' | 'variadic' | 'variadic+';
+export type ParameterArityType = 'optional' | 'required' | 'variadic';
 
 export type ParameterTypeHint =
 	// | 'lazy' // TODO: it might be good to *explicitly* mark certain parameters
@@ -125,12 +125,6 @@ export class FunctionImplementation {
 							max: Infinity,
 						};
 
-					case 'variadic+':
-						return {
-							min: acc.min + 1,
-							max: Infinity,
-						};
-
 					default:
 						throw new UnreachableError(arityType);
 				}
diff --git a/packages/xpath/src/functions/xforms/geo.ts b/packages/xpath/src/functions/xforms/geo.ts
index 81b0df981..37e59556b 100644
--- a/packages/xpath/src/functions/xforms/geo.ts
+++ b/packages/xpath/src/functions/xforms/geo.ts
@@ -208,7 +208,7 @@ const sum = (values: readonly number[]) => {
 
 export const distance = new NumberFunction(
 	'distance',
-	[{ arityType: 'variadic+' }],
+	[{ arityType: 'required' }, { arityType: 'variadic' }],
 	(context, args) => {
 		const lines = evaluateLines(context, args);