diff --git a/dv/verilator/pcount/cpp/ibex_pcounts.cc b/dv/verilator/pcount/cpp/ibex_pcounts.cc
index 60e9d535..733dcf09 100644
--- a/dv/verilator/pcount/cpp/ibex_pcounts.cc
+++ b/dv/verilator/pcount/cpp/ibex_pcounts.cc
@@ -10,7 +10,7 @@
 #include <svdpi.h>
 
 extern "C" {
-extern long long mhpmcounter_get(int index);
+extern unsigned long long mhpmcounter_get(int index);
 }
 
 #include "ibex_pcounts.h"
diff --git a/examples/simple_system/rtl/ibex_simple_system.sv b/examples/simple_system/rtl/ibex_simple_system.sv
index 1949a781..6d902ec7 100644
--- a/examples/simple_system/rtl/ibex_simple_system.sv
+++ b/examples/simple_system/rtl/ibex_simple_system.sv
@@ -279,7 +279,7 @@ module ibex_simple_system (
 
   export "DPI-C" function mhpmcounter_get;
 
-  function automatic longint mhpmcounter_get(int index);
+  function automatic longint unsigned mhpmcounter_get(int index);
     return u_core.u_ibex_core.cs_registers_i.mhpmcounter[index];
   endfunction