diff --git a/libc/test/src/stdio/vfprintf_test.cpp b/libc/test/src/stdio/vfprintf_test.cpp
--- a/libc/test/src/stdio/vfprintf_test.cpp
+++ b/libc/test/src/stdio/vfprintf_test.cpp
@@ -47,7 +47,7 @@
 }
 
 TEST(LlvmLibcVFPrintfTest, WriteToFile) {
-  const char *FILENAME = "fprintf_output.test";
+  const char *FILENAME = "vfprintf_output.test";
   auto FILE_PATH = libc_make_test_file_path(FILENAME);
 
   ::FILE *file = printf_test::fopen(FILE_PATH, "w");