diff --git a/mk/crates.mk b/mk/crates.mk
index 7ae5846..8e8b128 100644
--- a/mk/crates.mk
+++ b/mk/crates.mk
@@ -176,6 +176,7 @@ TARGET_SPECIFIC_alloc_jemalloc := 1
 DOC_CRATES := std alloc collections core libc rustc_unicode
 
 ifeq ($(CFG_DISABLE_JEMALLOC),)
+RUSTFLAGS_std := --cfg 'feature="jemalloc"'
 RUSTFLAGS_rustc_back := --cfg 'feature="jemalloc"'
 endif