diff --git a/rtl/ibex_cs_registers.sv b/rtl/ibex_cs_registers.sv
index 07dc728f..d1d791ae 100644
--- a/rtl/ibex_cs_registers.sv
+++ b/rtl/ibex_cs_registers.sv
@@ -508,6 +508,16 @@ module ibex_cs_registers #(
         illegal_csr = 1'b1;
       end
     endcase
+
+    if (!PMPEnable) begin
+      if (csr_addr inside {CSR_PMPCFG0,   CSR_PMPCFG1,   CSR_PMPCFG2,   CSR_PMPCFG3,
+                           CSR_PMPADDR0,  CSR_PMPADDR1,  CSR_PMPADDR2,  CSR_PMPADDR3,
+                           CSR_PMPADDR4,  CSR_PMPADDR5,  CSR_PMPADDR6,  CSR_PMPADDR7,
+                           CSR_PMPADDR8,  CSR_PMPADDR9,  CSR_PMPADDR10, CSR_PMPADDR11,
+                           CSR_PMPADDR12, CSR_PMPADDR13, CSR_PMPADDR14, CSR_PMPADDR15}) begin
+        illegal_csr = 1'b1;
+      end
+    end
   end
 
   // write logic