diff --git a/plat/arm/board/juno/include/platform_def.h b/plat/arm/board/juno/include/platform_def.h
index e096e33..d693c26 100644
--- a/plat/arm/board/juno/include/platform_def.h
+++ b/plat/arm/board/juno/include/platform_def.h
@@ -288,4 +288,15 @@
 /* System power domain level */
 #define CSS_SYSTEM_PWR_DMN_LVL		ARM_PWR_LVL2
 
+/*
+ * Physical and virtual address space limits for MMU in AARCH64 & AARCH32 modes
+ */
+#ifdef AARCH64
+#define PLAT_PHY_ADDR_SPACE_SIZE	(1ULL << 36)
+#define PLAT_VIRT_ADDR_SPACE_SIZE	(1ULL << 36)
+#else
+#define PLAT_PHY_ADDR_SPACE_SIZE	(1ULL << 32)
+#define PLAT_VIRT_ADDR_SPACE_SIZE	(1ULL << 32)
+#endif
+
 #endif /* PLATFORM_DEF_H */