diff --git a/arch/powerpc/boot/mpsc.c b/arch/powerpc/boot/mpsc.c
index f1c0e96..802ea53 100644
--- a/arch/powerpc/boot/mpsc.c
+++ b/arch/powerpc/boot/mpsc.c
@@ -17,7 +17,6 @@
 #include "io.h"
 #include "ops.h"
 
-extern void udelay(long delay);
 
 #define MPSC_CHR_1		0x000c
 
diff --git a/arch/powerpc/boot/mv64x60_i2c.c b/arch/powerpc/boot/mv64x60_i2c.c
index 435fe85..d085377 100644
--- a/arch/powerpc/boot/mv64x60_i2c.c
+++ b/arch/powerpc/boot/mv64x60_i2c.c
@@ -21,8 +21,6 @@
 #include "ops.h"
 #include "mv64x60.h"
 
-extern void udelay(long);
-
 /* Register defines */
 #define MV64x60_I2C_REG_SLAVE_ADDR			0x00
 #define MV64x60_I2C_REG_DATA				0x04
diff --git a/arch/powerpc/boot/ops.h b/arch/powerpc/boot/ops.h
index a10bf5a..e45b364 100644
--- a/arch/powerpc/boot/ops.h
+++ b/arch/powerpc/boot/ops.h
@@ -193,5 +193,6 @@
 	void *_platform_stack_top = _bss_stack + sizeof(_bss_stack);
 
 extern unsigned long timebase_period_ns;
+void udelay(long delay);
 
 #endif /* _PPC_BOOT_OPS_H_ */
diff --git a/arch/powerpc/boot/prpmc2800.c b/arch/powerpc/boot/prpmc2800.c
index f428bac..5c6cd36 100644
--- a/arch/powerpc/boot/prpmc2800.c
+++ b/arch/powerpc/boot/prpmc2800.c
@@ -25,8 +25,6 @@
 extern char _vmlinux_start[], _vmlinux_end[];
 extern char _dtb_start[], _dtb_end[];
 
-extern void udelay(long delay);
-
 #define KB	1024U
 #define MB	(KB*KB)
 #define GB	(KB*MB)
diff --git a/arch/powerpc/boot/serial.c b/arch/powerpc/boot/serial.c
index 3ce7f65..944f0ee 100644
--- a/arch/powerpc/boot/serial.c
+++ b/arch/powerpc/boot/serial.c
@@ -19,8 +19,6 @@
 #include "io.h"
 #include "ops.h"
 
-extern void udelay(long delay);
-
 static int serial_open(void)
 {
 	struct serial_console_data *scdp = console_ops.data;