diff --git a/src/test/cpp/filetestcase.cpp b/src/test/cpp/filetestcase.cpp
index d96dd1714..ea5c1d689 100644
--- a/src/test/cpp/filetestcase.cpp
+++ b/src/test/cpp/filetestcase.cpp
@@ -29,6 +29,10 @@
 #include <log4cxx/helpers/fileinputstream.h>
 #include <log4cxx/helpers/loglog.h>
 
+#if LOG4CXX_CFSTRING_API
+	#include <CoreFoundation/CFString.h>
+#endif
+
 using namespace log4cxx;
 using namespace log4cxx::helpers;