diff --git a/arch/um/include/shared/kern_util.h b/arch/um/include/shared/kern_util.h
index 95521b1f5b20..d8ffd2db168e 100644
--- a/arch/um/include/shared/kern_util.h
+++ b/arch/um/include/shared/kern_util.h
@@ -13,7 +13,6 @@ struct siginfo;
 
 extern int uml_exitcode;
 
-extern int ncpus;
 extern int kmalloc_ok;
 
 #define UML_ROUND_UP(addr) \
diff --git a/arch/um/kernel/um_arch.c b/arch/um/kernel/um_arch.c
index e95f805e5004..8e594cda6d77 100644
--- a/arch/um/kernel/um_arch.c
+++ b/arch/um/kernel/um_arch.c
@@ -126,9 +126,6 @@ unsigned long uml_reserved; /* Also modified in mem_init */
 unsigned long start_vm;
 unsigned long end_vm;
 
-/* Set in uml_ncpus_setup */
-int ncpus = 1;
-
 /* Set in early boot */
 static int have_root __initdata;
 static int have_console __initdata;