diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index f788086..9c2f171 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -153,7 +153,7 @@ if(NOT USE_SYSTEM_NCNN)
     option(WITH_LAYER_convolutiondepthwise "" ON)
     option(WITH_LAYER_padding "" ON)
     option(WITH_LAYER_squeeze "" OFF)
-    option(WITH_LAYER_expanddims "" OFF)
+    option(WITH_LAYER_expanddims "" ON)
     option(WITH_LAYER_normalize "" OFF)
     option(WITH_LAYER_permute "" OFF)
     option(WITH_LAYER_priorbox "" OFF)