diff --git a/dep/efsw/CMakeLists.txt b/dep/efsw/CMakeLists.txt
index eecc5531944..f268558a527 100644
--- a/dep/efsw/CMakeLists.txt
+++ b/dep/efsw/CMakeLists.txt
@@ -1,5 +1,6 @@
 if (BUILD_SHARED_LIBS)
   set(SRCS
+    src/efsw/Debug.cpp
     src/efsw/DirectorySnapshot.cpp
     src/efsw/DirectorySnapshotDiff.cpp
     src/efsw/DirWatcherGeneric.cpp