diff --git a/arch/powerpc/boot/of.c b/arch/powerpc/boot/of.c
index 62e2f43ec1df..7ca910cb2fc6 100644
--- a/arch/powerpc/boot/of.c
+++ b/arch/powerpc/boot/of.c
@@ -40,8 +40,8 @@ static void *of_try_claim(unsigned long size)
 #ifdef DEBUG
 		printf("    trying: 0x%08lx\n\r", claim_base);
 #endif
-		addr = (unsigned long)of_claim(claim_base, size, 0);
-		if ((void *)addr != (void *)-1)
+		addr = (unsigned long) of_claim(claim_base, size, 0);
+		if (addr != PROM_ERROR)
 			break;
 	}
 	if (addr == 0)
diff --git a/arch/powerpc/boot/of.h b/arch/powerpc/boot/of.h
index 0f058ef69521..504a0a31b685 100644
--- a/arch/powerpc/boot/of.h
+++ b/arch/powerpc/boot/of.h
@@ -6,7 +6,8 @@ typedef void *ihandle;
 
 void of_init(void *promptr);
 int of_call_prom(const char *service, int nargs, int nret, ...);
-void *of_claim(unsigned long virt, unsigned long size, unsigned long align);
+unsigned int of_claim(unsigned long virt, unsigned long size,
+	unsigned long align);
 void *of_vmlinux_alloc(unsigned long size);
 void of_exit(void);
 void *of_finddevice(const char *name);
diff --git a/arch/powerpc/boot/oflib.c b/arch/powerpc/boot/oflib.c
index 7f61f2eb5653..329437d0e943 100644
--- a/arch/powerpc/boot/oflib.c
+++ b/arch/powerpc/boot/oflib.c
@@ -147,7 +147,8 @@ static int check_of_version(void)
 	return 1;
 }
 
-void *of_claim(unsigned long virt, unsigned long size, unsigned long align)
+unsigned int of_claim(unsigned long virt, unsigned long size,
+		      unsigned long align)
 {
 	int ret;
 	prom_arg_t result;
@@ -155,32 +156,32 @@ void *of_claim(unsigned long virt, unsigned long size, unsigned long align)
 	if (need_map < 0)
 		need_map = check_of_version();
 	if (align || !need_map)
-		return (void *) of_call_prom("claim", 3, 1, virt, size, align);
+		return of_call_prom("claim", 3, 1, virt, size, align);
 
 	ret = of_call_prom_ret("call-method", 5, 2, &result, "claim", memory,
 			       align, size, virt);
 	if (ret != 0 || result == -1)
-		return (void *) -1;
+		return  -1;
 	ret = of_call_prom_ret("call-method", 5, 2, &result, "claim", chosen_mmu,
 			       align, size, virt);
 	/* 0x12 == coherent + read/write */
 	ret = of_call_prom("call-method", 6, 1, "map", chosen_mmu,
 			   0x12, size, virt, virt);
-	return (void *) virt;
+	return virt;
 }
 
 void *of_vmlinux_alloc(unsigned long size)
 {
 	unsigned long start = (unsigned long)_start, end = (unsigned long)_end;
-	void *addr;
+	unsigned long addr;
 	void *p;
 
 	/* With some older POWER4 firmware we need to claim the area the kernel
 	 * will reside in.  Newer firmwares don't need this so we just ignore
 	 * the return value.
 	 */
-	addr = of_claim(start, end - start, 0);
-	printf("Trying to claim from 0x%lx to 0x%lx (0x%lx) got %p\r\n",
+	addr = (unsigned long) of_claim(start, end - start, 0);
+	printf("Trying to claim from 0x%lx to 0x%lx (0x%lx) got %lx\r\n",
 	       start, end, end - start, addr);
 
 	p = malloc(size);