diff --git a/src/system/libroot/posix/malloc_hoard2/arch-specific.cpp b/src/system/libroot/posix/malloc_hoard2/arch-specific.cpp
index 20f4cdf913..688b602f6e 100644
--- a/src/system/libroot/posix/malloc_hoard2/arch-specific.cpp
+++ b/src/system/libroot/posix/malloc_hoard2/arch-specific.cpp
@@ -79,6 +79,8 @@ __init_after_fork(void)
 			sHeapBase);
 		exit(1);
 	}
+
+	hoardLockInit(sHeapLock, "heap");
 }