diff --git a/scripts/march-to-cpu-opt b/scripts/march-to-cpu-opt
index f6777f4b79d..bbf5978df8c 100755
--- a/scripts/march-to-cpu-opt
+++ b/scripts/march-to-cpu-opt
@@ -41,6 +41,7 @@ SPIKE_EXT_NOT_ALLOWED = [
 CPU_OPTIONS = {
   "xlen":            "",
   "vlen":            "",
+  "elen":            "",
   "extensions":      [],
 }
 
@@ -146,6 +147,16 @@ def get_vlen(ext_dict):
             vlen = max(vlen, zvelen)
     return vlen
 
+def get_elen(ext_dict, xlen):
+    elen = xlen
+
+    if "zve32x" in ext_dict or "zve32f" in ext_dict:
+        elen = 32
+    if "zve64x" in ext_dict or "zve64f" in ext_dict or "zve64d" in ext_dict:
+        elen = 64
+
+    return elen
+
 def print_qemu_cpu():
     cpu_options = []
     cpu_options.append("rv{0}".format(CPU_OPTIONS['xlen']))
@@ -186,7 +197,7 @@ def print_spike_varch():
     if not CPU_OPTIONS['vlen']:
         return ""
 
-    return "vlen:{0},elen:{1}".format(CPU_OPTIONS['vlen'], CPU_OPTIONS['xlen'])
+    return "vlen:{0},elen:{1}".format(CPU_OPTIONS['vlen'], CPU_OPTIONS['elen'])
 
 class TestArchStringParse(unittest.TestCase):
     def _test(self, arch, expected_arch_list, expected_vlen=0):
@@ -254,9 +265,12 @@ def parse_elf_file(elf_file_path):
     for extension in extension_dict.keys():
         extensions.append(extension)
 
+    xlen = get_xlen(elf_file_path)
+
     CPU_OPTIONS["extensions"] = extensions
     CPU_OPTIONS["vlen"] = get_vlen(extension_dict)
-    CPU_OPTIONS["xlen"] = get_xlen(elf_file_path)
+    CPU_OPTIONS["elen"] = get_elen(extension_dict, xlen)
+    CPU_OPTIONS["xlen"] = xlen
 
 def main(argv):
     opt = parse_opt(argv)