diff --git a/panda/src/putil/Sources.pp b/panda/src/putil/Sources.pp
index 9a1b5cd868..a417ceef88 100644
--- a/panda/src/putil/Sources.pp
+++ b/panda/src/putil/Sources.pp
@@ -160,7 +160,7 @@
   #define TARGET test_uniqueIdAllocator
 
   #define SOURCES \
-    test_uniqueIdAllocator.cxx
+    uniqueIdAllocator.cxx test_uniqueIdAllocator.cxx
 
 #end test_bin_target