diff --git a/java/ql/lib/ext/dummy.model.yml b/java/ql/lib/ext/dummy.model.yml
new file mode 100644
index 00000000000..01642dccae6
--- /dev/null
+++ b/java/ql/lib/ext/dummy.model.yml
@@ -0,0 +1,18 @@
+extensions:
+  # Make sure that the extensible model predicates are at least defined as empty.
+  - addsTo:
+      pack: codeql/java-all
+      extensible: extSourceModel
+    data: []
+  - addsTo:
+      pack: codeql/java-all
+      extensible: extSinkModel
+    data: []
+  - addsTo:
+      pack: codeql/java-all
+      extensible: extSummaryModel
+    data: []
+  - addsTo:
+      pack: codeql/java-all
+      extensible: extNegativeSummaryModel
+    data: []
\ No newline at end of file