diff --git a/core/arch/arm/kernel/user_ta.c b/core/arch/arm/kernel/user_ta.c
index 808cffd439f..e70061e3686 100644
--- a/core/arch/arm/kernel/user_ta.c
+++ b/core/arch/arm/kernel/user_ta.c
@@ -197,8 +197,12 @@ static struct mobj *alloc_ta_mem(size_t size)
 #else
 	struct mobj *mobj = mobj_mm_alloc(mobj_sec_ddr, size, &tee_mm_sec_ddr);
 
-	if (mobj)
-		memset(mobj_get_va(mobj, 0), 0, size);
+	if (mobj) {
+		size_t granularity = BIT(tee_mm_sec_ddr.shift);
+
+		/* Round up to allocation granularity size */
+		memset(mobj_get_va(mobj, 0), 0, ROUNDUP(size, granularity));
+	}
 	return mobj;
 #endif
 }