diff --git a/Koha/ERM/EUsage/CounterLog.pm b/Koha/ERM/EUsage/CounterLog.pm
index 4743a028bd..1dd7c5aa01 100644
--- a/Koha/ERM/EUsage/CounterLog.pm
+++ b/Koha/ERM/EUsage/CounterLog.pm
@@ -31,6 +31,18 @@ Koha::ERM::EUsage::CounterLog - Koha ErmCounterLog Object class
 
 =cut
 
+=head3 to_api_mapping
+
+This method returns the mapping for representing a Koha::ERM::EUsage::CounterLog
+on the API.
+
+=cut
+
+sub to_api_mapping {
+    return {
+        borrowernumber => 'patron_id',
+    };
+}
 
 =head3 patron
 
diff --git a/api/v1/swagger/definitions/erm_counter_log.yaml b/api/v1/swagger/definitions/erm_counter_log.yaml
index 572f78b6e1..22af4f6c6c 100644
--- a/api/v1/swagger/definitions/erm_counter_log.yaml
+++ b/api/v1/swagger/definitions/erm_counter_log.yaml
@@ -10,8 +10,8 @@ properties:
     type:
     - integer
     - "null"
-  borrowernumber:
-    description: borrowernumber of the counter log
+  patron_id:
+    description: patron_id of the counter log
     type:
     - integer
     - "null"
@@ -43,5 +43,5 @@ properties:
 additionalProperties: false
 required:
   - filename
-  - borrowernumber
+  - patron_id
   - counter_files_id
\ No newline at end of file