diff --git a/test/posix-mock-test.cc b/test/posix-mock-test.cc
index 13ed1220..86f98f7b 100644
--- a/test/posix-mock-test.cc
+++ b/test/posix-mock-test.cc
@@ -29,7 +29,7 @@
 #define _CRT_SECURE_NO_WARNINGS
 
 #include "posix-mock.h"
-#include <cppformat/posix.cc>
+#include "cppformat/posix.cc"
 
 #include <errno.h>
 #include <fcntl.h>