diff --git a/processor/src/main/resources/org.mapstruct.ap.model.MethodReference.ftl b/processor/src/main/resources/org.mapstruct.ap.model.MethodReference.ftl
index c9b799180..6599b921e 100644
--- a/processor/src/main/resources/org.mapstruct.ap.model.MethodReference.ftl
+++ b/processor/src/main/resources/org.mapstruct.ap.model.MethodReference.ftl
@@ -18,4 +18,4 @@
      limitations under the License.
 
 -->
-<#if declaringMapper??>${mapperVariableName}.</#if>${name}( ${ext.input} )
\ No newline at end of file
+<#if declaringMapper??>${mapperVariableName}.</#if>${name}<#if ext.input??>( ${ext.input} )<#else>()</#if>
\ No newline at end of file