diff --git a/nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-standard-prioritizers/src/main/java/org/apache/nifi/prioritizer/PriorityAttributePrioritizer.java b/nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-standard-prioritizers/src/main/java/org/apache/nifi/prioritizer/PriorityAttributePrioritizer.java
index 3d27930553..fdd963e65b 100644
--- a/nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-standard-prioritizers/src/main/java/org/apache/nifi/prioritizer/PriorityAttributePrioritizer.java
+++ b/nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-standard-prioritizers/src/main/java/org/apache/nifi/prioritizer/PriorityAttributePrioritizer.java
@@ -49,7 +49,7 @@ public class PriorityAttributePrioritizer implements FlowFilePrioritizer {
         String o1Priority = o1.getAttribute(CoreAttributes.PRIORITY.key());
         String o2Priority = o2.getAttribute(CoreAttributes.PRIORITY.key());
         if (o1Priority == null && o2Priority == null) {
-            return -1; // this is not 0 to match FirstInFirstOut
+            return 0;
         } else if (o2Priority == null) {
             return -1;
         } else if (o1Priority == null) {
diff --git a/nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-standard-prioritizers/src/test/java/org/apache/nifi/prioritizer/PriorityAttributePrioritizerTest.java b/nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-standard-prioritizers/src/test/java/org/apache/nifi/prioritizer/PriorityAttributePrioritizerTest.java
index 709855102b..d6ed2dc98c 100644
--- a/nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-standard-prioritizers/src/test/java/org/apache/nifi/prioritizer/PriorityAttributePrioritizerTest.java
+++ b/nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-standard-prioritizers/src/test/java/org/apache/nifi/prioritizer/PriorityAttributePrioritizerTest.java
@@ -83,7 +83,7 @@ public class PriorityAttributePrioritizerTest {
         assertEquals(-1, prioritizer.compare(ffNoPriority, null));
         assertEquals(1, prioritizer.compare(null, ffNoPriority));
 
-        assertEquals(-1, prioritizer.compare(ffNoPriority, ffNoPriority));
+        assertEquals(0, prioritizer.compare(ffNoPriority, ffNoPriority));
         assertEquals(-1, prioritizer.compare(ffPri1, ffNoPriority));
         assertEquals(1, prioritizer.compare(ffNoPriority, ffPri1));