diff --git a/arch/powerpc/kernel/setup_32.c b/arch/powerpc/kernel/setup_32.c
index 191d0ab09222..517ed1b1b160 100644
--- a/arch/powerpc/kernel/setup_32.c
+++ b/arch/powerpc/kernel/setup_32.c
@@ -63,10 +63,6 @@ unsigned int DMA_MODE_WRITE;
 
 int have_of = 1;
 
-#ifdef CONFIG_PPC_MULTIPLATFORM
-dev_t boot_dev;
-#endif /* CONFIG_PPC_MULTIPLATFORM */
-
 #ifdef CONFIG_VGA_CONSOLE
 unsigned long vgacon_remap_base;
 #endif
diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index b1b0cda3f748..ae6b67ce54e7 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -71,7 +71,6 @@
 
 int have_of = 1;
 int boot_cpuid = 0;
-dev_t boot_dev;
 u64 ppc64_pft_size;
 
 /* Pick defaults since we might want to patch instructions
diff --git a/arch/powerpc/platforms/powermac/setup.c b/arch/powerpc/platforms/powermac/setup.c
index 824a618396ab..cb1c342061e2 100644
--- a/arch/powerpc/platforms/powermac/setup.c
+++ b/arch/powerpc/platforms/powermac/setup.c
@@ -361,7 +361,7 @@ char *bootdevice;
 void *boot_host;
 int boot_target;
 int boot_part;
-extern dev_t boot_dev;
+static dev_t boot_dev;
 
 #ifdef CONFIG_SCSI
 void __init note_scsi_host(struct device_node *node, void *host)