diff --git a/src/internal/buildcfg/exp.go b/src/internal/buildcfg/exp.go
index e0d02b9d46..7704efa994 100644
--- a/src/internal/buildcfg/exp.go
+++ b/src/internal/buildcfg/exp.go
@@ -29,6 +29,7 @@ var experimentBaseline = goexperiment.Flags{
 	RegabiWrappers: regabiSupported,
 	RegabiG:        regabiSupported,
 	RegabiReflect:  regabiSupported,
+	RegabiDefer:    regabiSupported,
 }
 
 // FramePointerEnabled enables the use of platform conventions for