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-rw-r--r--db/fault_injection_test.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/db/fault_injection_test.cc b/db/fault_injection_test.cc
index 875dfe8..f8b2440 100644
--- a/db/fault_injection_test.cc
+++ b/db/fault_injection_test.cc
@@ -34,7 +34,7 @@ class FaultInjectionTestEnv;
namespace {
// Assume a filename, and not a directory name like "/foo/bar/"
-static std::string GetDirName(const std::string filename) {
+static std::string GetDirName(const std::string& filename) {
size_t found = filename.find_last_of("/\\");
if (found == std::string::npos) {
return "";