diff --git a/modules/openapi-generator/src/main/resources/typescript-fetch/runtime.mustache b/modules/openapi-generator/src/main/resources/typescript-fetch/runtime.mustache
index 29957247033..68a3811bb39 100644
--- a/modules/openapi-generator/src/main/resources/typescript-fetch/runtime.mustache
+++ b/modules/openapi-generator/src/main/resources/typescript-fetch/runtime.mustache
@@ -133,7 +133,7 @@ export class Configuration {
     constructor(private configuration: ConfigurationParameters = {}) {}
 
     get basePath(): string {
-        return this.configuration.basePath || BASE_PATH;
+        return this.configuration.basePath != null ? this.configuration.basePath : BASE_PATH;
     }
 
     get fetchApi(): FetchAPI {
diff --git a/samples/client/petstore/typescript-fetch/builds/default/runtime.ts b/samples/client/petstore/typescript-fetch/builds/default/runtime.ts
index dcd64eefb95..8862b423aaa 100644
--- a/samples/client/petstore/typescript-fetch/builds/default/runtime.ts
+++ b/samples/client/petstore/typescript-fetch/builds/default/runtime.ts
@@ -144,7 +144,7 @@ export class Configuration {
     constructor(private configuration: ConfigurationParameters = {}) {}
 
     get basePath(): string {
-        return this.configuration.basePath || BASE_PATH;
+        return this.configuration.basePath != null ? this.configuration.basePath : BASE_PATH;
     }
 
     get fetchApi(): FetchAPI {
diff --git a/samples/client/petstore/typescript-fetch/builds/es6-target/src/runtime.ts b/samples/client/petstore/typescript-fetch/builds/es6-target/src/runtime.ts
index dcd64eefb95..8862b423aaa 100644
--- a/samples/client/petstore/typescript-fetch/builds/es6-target/src/runtime.ts
+++ b/samples/client/petstore/typescript-fetch/builds/es6-target/src/runtime.ts
@@ -144,7 +144,7 @@ export class Configuration {
     constructor(private configuration: ConfigurationParameters = {}) {}
 
     get basePath(): string {
-        return this.configuration.basePath || BASE_PATH;
+        return this.configuration.basePath != null ? this.configuration.basePath : BASE_PATH;
     }
 
     get fetchApi(): FetchAPI {
diff --git a/samples/client/petstore/typescript-fetch/builds/multiple-parameters/runtime.ts b/samples/client/petstore/typescript-fetch/builds/multiple-parameters/runtime.ts
index dcd64eefb95..8862b423aaa 100644
--- a/samples/client/petstore/typescript-fetch/builds/multiple-parameters/runtime.ts
+++ b/samples/client/petstore/typescript-fetch/builds/multiple-parameters/runtime.ts
@@ -144,7 +144,7 @@ export class Configuration {
     constructor(private configuration: ConfigurationParameters = {}) {}
 
     get basePath(): string {
-        return this.configuration.basePath || BASE_PATH;
+        return this.configuration.basePath != null ? this.configuration.basePath : BASE_PATH;
     }
 
     get fetchApi(): FetchAPI {
diff --git a/samples/client/petstore/typescript-fetch/builds/prefix-parameter-interfaces/src/runtime.ts b/samples/client/petstore/typescript-fetch/builds/prefix-parameter-interfaces/src/runtime.ts
index dcd64eefb95..8862b423aaa 100644
--- a/samples/client/petstore/typescript-fetch/builds/prefix-parameter-interfaces/src/runtime.ts
+++ b/samples/client/petstore/typescript-fetch/builds/prefix-parameter-interfaces/src/runtime.ts
@@ -144,7 +144,7 @@ export class Configuration {
     constructor(private configuration: ConfigurationParameters = {}) {}
 
     get basePath(): string {
-        return this.configuration.basePath || BASE_PATH;
+        return this.configuration.basePath != null ? this.configuration.basePath : BASE_PATH;
     }
 
     get fetchApi(): FetchAPI {
diff --git a/samples/client/petstore/typescript-fetch/builds/typescript-three-plus/src/runtime.ts b/samples/client/petstore/typescript-fetch/builds/typescript-three-plus/src/runtime.ts
index 22aa191ef5f..c84478821a0 100644
--- a/samples/client/petstore/typescript-fetch/builds/typescript-three-plus/src/runtime.ts
+++ b/samples/client/petstore/typescript-fetch/builds/typescript-three-plus/src/runtime.ts
@@ -144,7 +144,7 @@ export class Configuration {
     constructor(private configuration: ConfigurationParameters = {}) {}
 
     get basePath(): string {
-        return this.configuration.basePath || BASE_PATH;
+        return this.configuration.basePath != null ? this.configuration.basePath : BASE_PATH;
     }
 
     get fetchApi(): FetchAPI {
diff --git a/samples/client/petstore/typescript-fetch/builds/with-interfaces/runtime.ts b/samples/client/petstore/typescript-fetch/builds/with-interfaces/runtime.ts
index dcd64eefb95..8862b423aaa 100644
--- a/samples/client/petstore/typescript-fetch/builds/with-interfaces/runtime.ts
+++ b/samples/client/petstore/typescript-fetch/builds/with-interfaces/runtime.ts
@@ -144,7 +144,7 @@ export class Configuration {
     constructor(private configuration: ConfigurationParameters = {}) {}
 
     get basePath(): string {
-        return this.configuration.basePath || BASE_PATH;
+        return this.configuration.basePath != null ? this.configuration.basePath : BASE_PATH;
     }
 
     get fetchApi(): FetchAPI {
diff --git a/samples/client/petstore/typescript-fetch/builds/with-npm-version/src/runtime.ts b/samples/client/petstore/typescript-fetch/builds/with-npm-version/src/runtime.ts
index dcd64eefb95..8862b423aaa 100644
--- a/samples/client/petstore/typescript-fetch/builds/with-npm-version/src/runtime.ts
+++ b/samples/client/petstore/typescript-fetch/builds/with-npm-version/src/runtime.ts
@@ -144,7 +144,7 @@ export class Configuration {
     constructor(private configuration: ConfigurationParameters = {}) {}
 
     get basePath(): string {
-        return this.configuration.basePath || BASE_PATH;
+        return this.configuration.basePath != null ? this.configuration.basePath : BASE_PATH;
     }
 
     get fetchApi(): FetchAPI {