diff --git a/src/openMVG/features/fast/fast_detector.cpp b/src/openMVG/features/fast/fast_detector.cpp
index 7223149..0daa5db 100644
--- a/src/openMVG/features/fast/fast_detector.cpp
+++ b/src/openMVG/features/fast/fast_detector.cpp
@@ -9,7 +9,9 @@
 #include "openMVG/features/fast/fast_detector.hpp"
 
 #include "openMVG/image/image_container.hpp"
+extern "C" {
 #include "third_party/fast/fast.h"
+}
 
 #include <iostream>
 //
diff --git a/src/third_party/fast/CMakeLists.txt b/src/third_party/fast/CMakeLists.txt
index dc0aba6..7361dc0 100644
--- a/src/third_party/fast/CMakeLists.txt
+++ b/src/third_party/fast/CMakeLists.txt
@@ -1,6 +1,5 @@
 
 file(GLOB_RECURSE C_FILES ${CMAKE_CURRENT_SOURCE_DIR} *.c)
-set_source_files_properties(${C_FILES} PROPERTIES LANGUAGE CXX)
 add_library(openMVG_fast STATIC ${C_FILES})
 set_property(TARGET openMVG_fast PROPERTY FOLDER OpenMVG/3rdParty)