diff --git a/target/riscv/pmp.c b/target/riscv/pmp.c
index 03abd8f..15a5366 100644
--- a/target/riscv/pmp.c
+++ b/target/riscv/pmp.c
@@ -138,7 +138,7 @@
         return;
     } else {
         target_ulong t1 = ctz64(~a);
-        target_ulong base = (a & ~(((target_ulong)1 << t1) - 1)) << 3;
+        target_ulong base = (a & ~(((target_ulong)1 << t1) - 1)) << 2;
         target_ulong range = ((target_ulong)1 << (t1 + 3)) - 1;
         *sa = base;
         *ea = base + range;