diff --git a/t/test-lib.sh b/t/test-lib.sh
index ba5186c859b435..9af5fb7674d7a4 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -76,6 +76,7 @@ prepend_var ASAN_OPTIONS : detect_leaks=0
 export ASAN_OPTIONS
 
 prepend_var LSAN_OPTIONS : $GIT_SAN_OPTIONS
+prepend_var LSAN_OPTIONS : fast_unwind_on_malloc=0
 export LSAN_OPTIONS
 
 if test ! -f "$GIT_BUILD_DIR"/GIT-BUILD-OPTIONS