diff --git a/tests/stdlib_test.cpp b/tests/stdlib_test.cpp
index c724f74..7d2dc20 100644
--- a/tests/stdlib_test.cpp
+++ b/tests/stdlib_test.cpp
@@ -184,7 +184,9 @@
 
 TEST(stdlib, realpath__NULL_filename) {
   errno = 0;
-  char* p = realpath(NULL, NULL);
+  // Work around the compile-time error generated by FORTIFY here.
+  const char* path = NULL;
+  char* p = realpath(path, NULL);
   ASSERT_TRUE(p == NULL);
   ASSERT_EQ(EINVAL, errno);
 }