diff --git a/src/lstm/fullyconnected.h b/src/lstm/fullyconnected.h
index 3199617c7f..5bb0f83fc5 100644
--- a/src/lstm/fullyconnected.h
+++ b/src/lstm/fullyconnected.h
@@ -47,7 +47,7 @@ class FullyConnected : public Network {
     else if (type_ == NT_POSCLIP)
       spec.add_str_int("Fp", no_);
     else if (type_ == NT_SYMCLIP)
-      spec.add_str_int("Fs", no_);
+      spec.add_str_int("Fn", no_);
     else if (type_ == NT_SOFTMAX)
       spec.add_str_int("Fc", no_);
     else