diff --git a/TARGETS b/TARGETS
index bccdc48bc..9a951ddde 100644
--- a/TARGETS
+++ b/TARGETS
@@ -67,6 +67,16 @@ is_opt_mode = build_mode.startswith("opt")
 if is_opt_mode:
     rocksdb_compiler_flags.append("-DNDEBUG")
 
+default_allocator = read_config("fbcode", "default_allocator")
+
+sanitizer = read_config("fbcode", "sanitizer")
+
+# Let RocksDB aware of jemalloc existence.
+# Do not enable it if sanitizer presents.
+if default_allocator.startswith("jemalloc") and sanitizer == "":
+    rocksdb_compiler_flags.append("-DROCKSDB_JEMALLOC")
+    rocksdb_external_deps.append(("jemalloc", None, "headers"))
+
 cpp_library(
     name = "rocksdb_lib",
     srcs = [
diff --git a/buckifier/targets_cfg.py b/buckifier/targets_cfg.py
index e63a2860f..98e1f51e2 100644
--- a/buckifier/targets_cfg.py
+++ b/buckifier/targets_cfg.py
@@ -70,6 +70,16 @@ is_opt_mode = build_mode.startswith("opt")
 # doesn't harm and avoid forgetting to add it.
 if is_opt_mode:
     rocksdb_compiler_flags.append("-DNDEBUG")
+
+default_allocator = read_config("fbcode", "default_allocator")
+
+sanitizer = read_config("fbcode", "sanitizer")
+
+# Let RocksDB aware of jemalloc existence.
+# Do not enable it if sanitizer presents.
+if default_allocator.startswith("jemalloc") and sanitizer == "":
+    rocksdb_compiler_flags.append("-DROCKSDB_JEMALLOC")
+    rocksdb_external_deps.append(("jemalloc", None, "headers"))
 """