diff --git a/docs/changelog/108834.yaml b/docs/changelog/108834.yaml
new file mode 100644
index 0000000000000..044056fa9a9da
--- /dev/null
+++ b/docs/changelog/108834.yaml
@@ -0,0 +1,6 @@
+pr: 108834
+summary: "[ESQL] Mark `date_diff` as requiring all three arguments"
+area: ES|QL
+type: bug
+issues:
+ - 108383
diff --git a/x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/expression/function/scalar/date/DateDiff.java b/x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/expression/function/scalar/date/DateDiff.java
index 8378d622b3276..8c55c99494385 100644
--- a/x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/expression/function/scalar/date/DateDiff.java
+++ b/x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/expression/function/scalar/date/DateDiff.java
@@ -16,7 +16,6 @@
 import org.elasticsearch.xpack.esql.expression.function.scalar.EsqlScalarFunction;
 import org.elasticsearch.xpack.ql.InvalidArgumentException;
 import org.elasticsearch.xpack.ql.expression.Expression;
-import org.elasticsearch.xpack.ql.expression.function.OptionalArgument;
 import org.elasticsearch.xpack.ql.tree.NodeInfo;
 import org.elasticsearch.xpack.ql.tree.Source;
 import org.elasticsearch.xpack.ql.type.DataType;
@@ -47,7 +46,7 @@
  * in multiples of the unit specified in the first argument.
  * If the second argument (start) is greater than the third argument (end), then negative values are returned.
  */
-public class DateDiff extends EsqlScalarFunction implements OptionalArgument {
+public class DateDiff extends EsqlScalarFunction {
 
     public static final ZoneId UTC = ZoneId.of("Z");