diff --git a/panda/src/downloader/decompressor.cxx b/panda/src/downloader/decompressor.cxx
index df903417b3..59030741b2 100644
--- a/panda/src/downloader/decompressor.cxx
+++ b/panda/src/downloader/decompressor.cxx
@@ -22,6 +22,7 @@
 
 #include "error_utils.h"
 #include "filename.h"
+#include "buffer.h"
 #include "zStream.h"
 
 #include "decompressor.h"