diff --git a/types/node/index.d.ts b/types/node/index.d.ts
index 9753d31cc6..e673039fe9 100644
--- a/types/node/index.d.ts
+++ b/types/node/index.d.ts
@@ -1710,6 +1710,7 @@ declare module "os" {
         netmask: string;
         mac: string;
         internal: boolean;
+        cidr: string | null;
     }
 
     export interface NetworkInterfaceInfoIPv4 extends NetworkInterfaceBase {
diff --git a/types/node/v8/index.d.ts b/types/node/v8/index.d.ts
index 729a0c0da8..af15c21fda 100644
--- a/types/node/v8/index.d.ts
+++ b/types/node/v8/index.d.ts
@@ -1588,6 +1588,7 @@ declare module "os" {
         netmask: string;
         mac: string;
         internal: boolean;
+        cidr: string | null;
     }
 
     export interface NetworkInterfaceInfoIPv4 extends NetworkInterfaceBase {
diff --git a/types/node/v9/index.d.ts b/types/node/v9/index.d.ts
index ba7347e849..2a110b6c9b 100644
--- a/types/node/v9/index.d.ts
+++ b/types/node/v9/index.d.ts
@@ -1677,6 +1677,7 @@ declare module "os" {
         netmask: string;
         mac: string;
         internal: boolean;
+        cidr: string | null;
     }
 
     export interface NetworkInterfaceInfoIPv4 extends NetworkInterfaceBase {