diff --git a/maven-failsafe-plugin/src/main/java/org/apache/maven/plugin/failsafe/util/FailsafeSummaryXmlUtils.java b/maven-failsafe-plugin/src/main/java/org/apache/maven/plugin/failsafe/util/FailsafeSummaryXmlUtils.java
index 149e19118e..9fb01a46ca 100644
--- a/maven-failsafe-plugin/src/main/java/org/apache/maven/plugin/failsafe/util/FailsafeSummaryXmlUtils.java
+++ b/maven-failsafe-plugin/src/main/java/org/apache/maven/plugin/failsafe/util/FailsafeSummaryXmlUtils.java
@@ -92,6 +92,7 @@ public static RunResult toRunResult(File failsafeSummaryXml) throws Exception {
                     parseInt(errors),
                     parseInt(failures),
                     parseInt(skipped),
+                    // Backwards compatability - to be replaced with parseInt in a future release
                     isBlank(flakes) ? 0 : parseInt(flakes),
                     isBlank(failureMessage) ? null : unescapeXml(failureMessage),
                     parseBoolean(timeout));
diff --git a/maven-surefire-plugin/src/site/resources/xsd/failsafe-summary.xsd b/maven-surefire-plugin/src/site/resources/xsd/failsafe-summary.xsd
index 216690a98a..1cb22b2d57 100644
--- a/maven-surefire-plugin/src/site/resources/xsd/failsafe-summary.xsd
+++ b/maven-surefire-plugin/src/site/resources/xsd/failsafe-summary.xsd
@@ -25,7 +25,7 @@
         <xsd:element name="errors" type="xsd:int"/>
         <xsd:element name="failures" type="xsd:int"/>
         <xsd:element name="skipped" type="xsd:int"/>
-        <xsd:element name="flakes" type="xsd:int" nillable="true"/>
+        <xsd:element name="flakes" type="xsd:int" minOccurs="0"/>
         <xsd:element name="failureMessage" type="xsd:string" nillable="true"/>
       </xsd:sequence>
       <xsd:attribute name="result" type="errorType" use="optional"/>
diff --git a/surefire-api/src/main/java/org/apache/maven/surefire/api/suite/RunResult.java b/surefire-api/src/main/java/org/apache/maven/surefire/api/suite/RunResult.java
index e05c881269..545e7ab447 100644
--- a/surefire-api/src/main/java/org/apache/maven/surefire/api/suite/RunResult.java
+++ b/surefire-api/src/main/java/org/apache/maven/surefire/api/suite/RunResult.java
@@ -221,6 +221,7 @@ public int hashCode() {
         result = 31 * result + errors;
         result = 31 * result + failures;
         result = 31 * result + skipped;
+        result = 31 * result + flakes;
         result = 31 * result + (failure != null ? failure.hashCode() : 0);
         result = 31 * result + (timeout ? 1 : 0);
         return result;