diff --git a/kernel/src/services.rs b/kernel/src/services.rs
index 2042968e5..10b941958 100644
--- a/kernel/src/services.rs
+++ b/kernel/src/services.rs
@@ -219,7 +219,7 @@ impl Default for ProcessInner {
             mem_message_last: arch::mem::DEFAULT_MESSAGE_BASE,
             mem_heap_base: arch::mem::DEFAULT_HEAP_BASE,
             mem_heap_size: 0,
-            mem_heap_max: if cfg!("big-heap") {
+            mem_heap_max: if cfg!(feature = "big-heap") {
                 1024 * 1024 * 12
             } else {
                 1024 * 512