diff --git a/mk/main.mk b/mk/main.mk
index 7ed134d60fb..aba02088eab 100644
--- a/mk/main.mk
+++ b/mk/main.mk
@@ -155,6 +155,7 @@ endif
 RUSTFLAGS_STAGE0 += -C prefer-dynamic
 RUSTFLAGS_STAGE1 += -C prefer-dynamic
 RUST_LIB_FLAGS_ST2 += -C prefer-dynamic
+RUST_LIB_FLAGS_ST3 += -C prefer-dynamic
 
 # Landing pads require a lot of codegen. We can get through bootstrapping faster
 # by not emitting them.