diff --git a/.changeset/fresh-turkeys-hang.md b/.changeset/fresh-turkeys-hang.md
new file mode 100644
index 00000000..247a10f5
--- /dev/null
+++ b/.changeset/fresh-turkeys-hang.md
@@ -0,0 +1,5 @@
+---
+"@theoplayer/nielsen-connector-web": minor
+---
+
+Added an optional c4 parameter to `NielsenDCRContentMetadataCZ`.
diff --git a/nielsen/src/nielsen/Types.ts b/nielsen/src/nielsen/Types.ts
index 049fba98..d480836b 100644
--- a/nielsen/src/nielsen/Types.ts
+++ b/nielsen/src/nielsen/Types.ts
@@ -129,6 +129,12 @@ export type NielsenDCRContentMetadataCZ = NielsenDCRContentMetadata & {
      * [LIVE] Keep empty : "nol_c2":"p2,"
      */
     c2?: string;
+    /*
+     * The actual duration of the live broadcast
+     * [VOD] Keep empty
+     * [LIVE] Pass the duration of the live broadcast in seconds
+     */
+    c4?: string;
     /*
      * CMS tag helper item. Indication of whether the content being played supports the insertion of advertisements. “0” – No ads “1” – Supports ads “2” – Don't know (default).
      */
@@ -162,6 +168,12 @@ export type DCRContentMetadataCZ = DCRContentMetadata & {
      * [LIVE] Keep empty : "nol_c2":"p2,"
      */
     nol_c2?: string;
+    /*
+     * The actual duration of the live broadcast
+     * [VOD] Keep empty
+     * [LIVE] Pass the value in seconds as follows "nol_c4" : "p4,value_in_seconds"
+     */
+    nol_c4?: string;
     /*
      * CMS tag helper item. Indication of whether the content being played supports the insertion of advertisements. “0” – No ads “1” – Supports ads “2” – Don't know (default).
      */
diff --git a/nielsen/src/utils/Util.ts b/nielsen/src/utils/Util.ts
index a0d5da2c..f2c3b3a4 100644
--- a/nielsen/src/utils/Util.ts
+++ b/nielsen/src/utils/Util.ts
@@ -41,16 +41,17 @@ export function buildDCRContentMetadata(
         adloadtype: metadata.adloadtype
     };
     if (country === NielsenCountry.CZ) {
-        const { crossId1, segB, segC, c1, c2, hasAds } = metadata as NielsenDCRContentMetadataCZ;
+        const { crossId1, segB, segC, c1, c2, c4, hasAds } = metadata as NielsenDCRContentMetadataCZ;
         const dcrContentMetadataCZ: DCRContentMetadataCZ = {
             ...dcrContentMetadata,
             ['crossId1']: crossId1,
+            ['nol_c1']: `p1,${c1 ?? ''}`,
             ['nol_c2']: `p2,${c2 ?? ''}`,
+            ['nol_c4']: `p4,${c4 ?? ''}`,
             segB: segB,
             segC: segC ?? '',
             hasAds: hasAds
         };
-        if (c1) dcrContentMetadataCZ['nol_c1'] = `p1,${c1}`;
         return dcrContentMetadataCZ;
     }
     if (country === NielsenCountry.US) {