diff --git a/jenkins_jobs/modules/properties.py b/jenkins_jobs/modules/properties.py
index 6aaaf51b7..c53c5af59 100644
--- a/jenkins_jobs/modules/properties.py
+++ b/jenkins_jobs/modules/properties.py
@@ -381,9 +381,9 @@ def branch_api(registry, xml_parent, data):
     :arg int number-of-builds: The maximum number of builds allowed within
         the specified time period. (default 1)
     :arg str time-period: The time period within which the maximum number
-        of builds will be enforced. (default 'Hour')
+        of builds will be enforced. (default 'hour')
 
-        :valid values: **Second** **Minute** **Hour**, **Day**, **Week**, **Month**, **Year**
+        :valid values: **second** **minute** **hour**, **day**, **week**, **month**, **year**
     :arg bool skip-rate-limit: Permit user triggered builds to
         skip the rate limit (default false)
 
@@ -404,10 +404,10 @@ def branch_api(registry, xml_parent, data):
     )
     branch.set("plugin", "branch-api")
 
-    valid_time_periods = ["Second", "Minute", "Hour", "Day", "Week", "Month", "Year"]
+    valid_time_periods = ["second", "minute", "hour", "day", "week", "month", "year"]
 
     mapping = [
-        ("time-period", "durationName", "Hour", valid_time_periods),
+        ("time-period", "durationName", "hour", valid_time_periods),
         ("number-of-builds", "count", 1),
         ("skip-rate-limit", "userBoost", False),
     ]
diff --git a/tests/properties/fixtures/branch-api-full.xml b/tests/properties/fixtures/branch-api-full.xml
index 90832bac1..05ad4ce25 100644
--- a/tests/properties/fixtures/branch-api-full.xml
+++ b/tests/properties/fixtures/branch-api-full.xml
@@ -2,7 +2,7 @@
 <project>
   <properties>
     <jenkins.branch.RateLimitBranchProperty_-JobPropertyImpl plugin="branch-api">
-      <durationName>Day</durationName>
+      <durationName>day</durationName>
       <count>5</count>
       <userBoost>true</userBoost>
     </jenkins.branch.RateLimitBranchProperty_-JobPropertyImpl>
diff --git a/tests/properties/fixtures/branch-api-full.yaml b/tests/properties/fixtures/branch-api-full.yaml
index 6adc44c71..64f53e4df 100644
--- a/tests/properties/fixtures/branch-api-full.yaml
+++ b/tests/properties/fixtures/branch-api-full.yaml
@@ -1,5 +1,5 @@
 properties:
   - branch-api:
-      time-period: Day
+      time-period: day
       number-of-builds: 5
       skip-rate-limit: true
diff --git a/tests/properties/fixtures/branch-api-minimal.xml b/tests/properties/fixtures/branch-api-minimal.xml
index f483478f7..d537f8698 100644
--- a/tests/properties/fixtures/branch-api-minimal.xml
+++ b/tests/properties/fixtures/branch-api-minimal.xml
@@ -2,7 +2,7 @@
 <project>
   <properties>
     <jenkins.branch.RateLimitBranchProperty_-JobPropertyImpl plugin="branch-api">
-      <durationName>Hour</durationName>
+      <durationName>hour</durationName>
       <count>1</count>
       <userBoost>false</userBoost>
     </jenkins.branch.RateLimitBranchProperty_-JobPropertyImpl>
diff --git a/tests/properties/fixtures/branch-api-minute.xml b/tests/properties/fixtures/branch-api-minute.xml
index e6c152ee4..8a19259dc 100644
--- a/tests/properties/fixtures/branch-api-minute.xml
+++ b/tests/properties/fixtures/branch-api-minute.xml
@@ -2,7 +2,7 @@
 <project>
   <properties>
     <jenkins.branch.RateLimitBranchProperty_-JobPropertyImpl plugin="branch-api">
-      <durationName>Minute</durationName>
+      <durationName>minute</durationName>
       <count>3</count>
       <userBoost>false</userBoost>
     </jenkins.branch.RateLimitBranchProperty_-JobPropertyImpl>
diff --git a/tests/properties/fixtures/branch-api-minute.yaml b/tests/properties/fixtures/branch-api-minute.yaml
index 4fa8a521a..1169fe324 100644
--- a/tests/properties/fixtures/branch-api-minute.yaml
+++ b/tests/properties/fixtures/branch-api-minute.yaml
@@ -1,4 +1,4 @@
 properties:
   - branch-api:
-      time-period: Minute
+      time-period: minute
       number-of-builds: 3