diff --git a/src/downloader/CMakeLists.txt b/src/downloader/CMakeLists.txt
index 99b94e1655..a60cda849b 100644
--- a/src/downloader/CMakeLists.txt
+++ b/src/downloader/CMakeLists.txt
@@ -17,7 +17,7 @@ set(SLIC3R_DOWNLOADER_SOURCES
 if (APPLE)
     list(APPEND SLIC3R_DOWNLOADER_SOURCES
            InstanceSendMac.mm
-	     InstanceSendMac.hpp
+	     InstanceSendMac.h
         )
 endif ()