diff --git a/sys_funcs.cc b/sys_funcs.cc
index 1b30bf027..a82ac0b62 100644
--- a/sys_funcs.cc
+++ b/sys_funcs.cc
@@ -34,7 +34,6 @@ static const struct sfunc_return_type sfunc_table[] = {
       { "$bitstoreal", IVL_VT_REAL,   1, 0 },
       { "$itor",       IVL_VT_REAL,   1, 0 },
       { "$realtobits", IVL_VT_LOGIC, 64, 0 },
-      { "$rtoi",       IVL_VT_LOGIC, 32, 0 },
       { "$time",       IVL_VT_LOGIC, 64, 0 },
       { "$stime",      IVL_VT_LOGIC, 32, 0 },
       { "$simtime",    IVL_VT_LOGIC, 64, 0 },
diff --git a/vpi/system.sft b/vpi/system.sft
index 0a2e99496..76f82bd30 100644
--- a/vpi/system.sft
+++ b/vpi/system.sft
@@ -4,6 +4,7 @@
 #
 
 $random            vpiSysFuncInt
+$rtoi              vpiSysFuncInt
 $urandom           vpiSysFuncSized 32 unsigned
 $urandom_range     vpiSysFuncSized 32 unsigned
 $dist_uniform      vpiSysFuncInt