diff --git a/src/bin/start-keycloak/start-keycloak.ts b/src/bin/start-keycloak/start-keycloak.ts
index 1f501e06..206f6f5e 100644
--- a/src/bin/start-keycloak/start-keycloak.ts
+++ b/src/bin/start-keycloak/start-keycloak.ts
@@ -357,7 +357,7 @@ export async function command(params: { cliCommandOptions: CliCommandOptions })
             : [
                   `-v${SPACE_PLACEHOLDER}".${pathSep}${pathRelative(process.cwd(), realmJsonFilePath)}":/opt/keycloak/data/import/myrealm-realm.json`
               ]),
-        `-v${SPACE_PLACEHOLDER}"./${pathRelative(process.cwd(), jarFilePath_cacheDir)}":/opt/keycloak/providers/keycloak-theme.jar`,
+        `-v${SPACE_PLACEHOLDER}".${pathSep}${pathRelative(process.cwd(), jarFilePath_cacheDir)}":/opt/keycloak/providers/keycloak-theme.jar`,
         ...extensionJarFilePaths.map(
             jarFilePath =>
                 `-v${SPACE_PLACEHOLDER}".${pathSep}${pathRelative(process.cwd(), jarFilePath)}":/opt/keycloak/providers/${pathBasename(jarFilePath)}`