diff --git a/tests/gtest_ex.h b/tests/gtest_ex.h
index 41ee22b..fe1d894 100644
--- a/tests/gtest_ex.h
+++ b/tests/gtest_ex.h
@@ -16,8 +16,15 @@
 
 #include <gtest/gtest.h>
 
+#include <sys/types.h>
+#include <sys/wait.h>
+
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+
 template<typename F>
-void test_forked(F test) {
+void test_isolated(F test) {
   int pid = fork();
   ASSERT_NE(-1, pid) << strerror(errno);