diff --git a/packages/rtk-query-codegen-openapi/src/generate.ts b/packages/rtk-query-codegen-openapi/src/generate.ts
index 123c0433c9..cf31c9b635 100644
--- a/packages/rtk-query-codegen-openapi/src/generate.ts
+++ b/packages/rtk-query-codegen-openapi/src/generate.ts
@@ -259,7 +259,7 @@ export async function generateApi(
     const allNames = parameters.map((p) => p.name);
     const queryArg: QueryArgDefinitions = {};
     for (const param of parameters) {
-      const isPureSnakeCase = /^[a-zA-Z][\\w]*$/.test(param.name);
+      const isPureSnakeCase = /^[a-zA-Z][\w]*$/.test(param.name);
       const camelCaseName = camelCase(param.name);
 
       const name = isPureSnakeCase && !allNames.includes(camelCaseName) ? camelCaseName : param.name;
diff --git a/packages/rtk-query-codegen-openapi/test/__snapshots__/generateEndpoints.test.ts.snap b/packages/rtk-query-codegen-openapi/test/__snapshots__/generateEndpoints.test.ts.snap
index 1f01cf2155..53cd1d4bcd 100644
--- a/packages/rtk-query-codegen-openapi/test/__snapshots__/generateEndpoints.test.ts.snap
+++ b/packages/rtk-query-codegen-openapi/test/__snapshots__/generateEndpoints.test.ts.snap
@@ -1005,7 +1005,7 @@ const injectedRtkApi = api
     overrideExisting: false,
   });
 export { injectedRtkApi as enhancedApi };
-export type GetStructureDefinitionApiResponse = unknown;
+export type GetStructureDefinitionApiResponse = /** status 200 Success */ FhirJsonResource;
 export type GetStructureDefinitionApiArg = {
   /** Some description */
   foo?: any;
@@ -1024,6 +1024,7 @@ export type GetStructureDefinitionApiArg = {
   /** Some description */
   naming_conflict?: any;
 };
+export type FhirJsonResource = object;
 export const { useGetStructureDefinitionQuery } = injectedRtkApi;
 
 `;