diff --git a/mk/crates.mk b/mk/crates.mk
index 3021727cb109f..bfd054ae988f2 100644
--- a/mk/crates.mk
+++ b/mk/crates.mk
@@ -144,8 +144,7 @@ TARGET_CRATES += alloc_jemalloc
 DEPS_std += alloc_jemalloc
 DEPS_alloc_jemalloc := core libc native:jemalloc
 ONLY_RLIB_alloc_jemalloc := 1
-else
-RUSTFLAGS_rustc_back := --cfg disable_jemalloc
+RUSTFLAGS_rustc_back := --cfg 'feature="jemalloc"'
 endif
 
 ################################################################################
diff --git a/src/librustc_back/target/mod.rs b/src/librustc_back/target/mod.rs
index a6aef52caf6ed..0920155ef423d 100644
--- a/src/librustc_back/target/mod.rs
+++ b/src/librustc_back/target/mod.rs
@@ -501,9 +501,9 @@ impl Target {
 }
 
 fn maybe_jemalloc() -> String {
-    if cfg!(disable_jemalloc) {
-        "alloc_system".to_string()
-    } else {
+    if cfg!(feature = "jemalloc") {
         "alloc_jemalloc".to_string()
+    } else {
+        "alloc_system".to_string()
     }
 }