1 files changed, 4 insertions, 0 deletions
diff --git a/libc/test/UnitTest/BazelFilePath.cpp b/libc/test/UnitTest/BazelFilePath.cpp
index ee5fcaa..7f9f42b 100644
--- a/libc/test/UnitTest/BazelFilePath.cpp
+++ b/libc/test/UnitTest/BazelFilePath.cpp
@@ -20,6 +20,10 @@ namespace testing {
 CString libc_make_test_file_path_func(const char *file_name) {
   // This is the path to the folder bazel wants the test outputs written to.
   const char *UNDECLARED_OUTPUTS_PATH = getenv("TEST_UNDECLARED_OUTPUTS_DIR");
+  // Do something sensible if not run under bazel, otherwise this may segfault
+  // when constructing the string.
+  if (UNDECLARED_OUTPUTS_PATH == nullptr)
+    UNDECLARED_OUTPUTS_PATH = "";
 
   return cpp::string(UNDECLARED_OUTPUTS_PATH) + file_name;
 }