diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 3180457..037664d 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -599,7 +599,8 @@
 
 config TASK_SIZE
 	hex "Size of user task space" if TASK_SIZE_BOOL
-	default "0x80000000"
+	default "0x80000000" if PPC_PREP || PPC_8xx
+	default "0xc0000000"
 
 config CONSISTENT_START_BOOL
 	bool "Set custom consistent memory pool address"