diff --git a/src/openApi/v2/parser/getServiceVersion.ts b/src/openApi/v2/parser/getServiceVersion.ts
index 9986f1af..7d860d6d 100644
--- a/src/openApi/v2/parser/getServiceVersion.ts
+++ b/src/openApi/v2/parser/getServiceVersion.ts
@@ -4,5 +4,5 @@
  * @param version
  */
 export function getServiceVersion(version = '1.0'): string {
-    return version.replace(/^v/gi, '');
+    return String(version).replace(/^v/gi, '');
 }
diff --git a/src/openApi/v3/parser/getServiceVersion.ts b/src/openApi/v3/parser/getServiceVersion.ts
index 9986f1af..7d860d6d 100644
--- a/src/openApi/v3/parser/getServiceVersion.ts
+++ b/src/openApi/v3/parser/getServiceVersion.ts
@@ -4,5 +4,5 @@
  * @param version
  */
 export function getServiceVersion(version = '1.0'): string {
-    return version.replace(/^v/gi, '');
+    return String(version).replace(/^v/gi, '');
 }