diff --git a/arch/powerpc/include/asm/book3s/64/mmu.h b/arch/powerpc/include/asm/book3s/64/mmu.h
index 5854263d4d6e4bec7d91df217448eae208ccdd30..d4eda6420523fe9ed5cd4d0bbb7a64ac19c45b7a 100644
--- a/arch/powerpc/include/asm/book3s/64/mmu.h
+++ b/arch/powerpc/include/asm/book3s/64/mmu.h
@@ -23,7 +23,12 @@ struct mmu_psize_def {
 };
 extern struct mmu_psize_def mmu_psize_defs[MMU_PAGE_COUNT];
 
+#ifdef CONFIG_PPC_RADIX_MMU
 #define radix_enabled() mmu_has_feature(MMU_FTR_RADIX)
+#else
+#define radix_enabled() (0)
+#endif
+
 
 #endif /* __ASSEMBLY__ */