diff --git a/src/types/browse.d.ts b/src/types/browse.d.ts
index e48d0e99..691251a2 100644
--- a/src/types/browse.d.ts
+++ b/src/types/browse.d.ts
@@ -31,7 +31,7 @@ export interface IBrowseParameters {
   hiddenFacets?: string[];
   variationsMap?: VariationsMap;
   qsParam?: Record<string, any>;
-  filterMatchTypes: Record<string, 'all'| 'any' | 'none'>
+  filterMatchTypes?: Record<string, 'all'| 'any' | 'none'>
 }
 
 declare class Browse {
diff --git a/src/types/search.d.ts b/src/types/search.d.ts
index eb3288d3..5c865e0f 100644
--- a/src/types/search.d.ts
+++ b/src/types/search.d.ts
@@ -30,7 +30,7 @@ export interface SearchParameters {
   hiddenFacets?: string[];
   variationsMap?: VariationsMap;
   qsParam?: Record<string, any>;
-  filterMatchTypes: Record<string, 'all'| 'any' | 'none'>
+  filterMatchTypes?: Record<string, 'all'| 'any' | 'none'>
 }
 declare class Search {
   constructor(options: ConstructorClientOptions);