diff --git a/proto/ei-scanner b/proto/ei-scanner
index d23fea7..af30558 100755
--- a/proto/ei-scanner
+++ b/proto/ei-scanner
@@ -520,7 +520,7 @@ class ProtocolParser(xml.sax.handler.ContentHandler):
 
             try:
                 name = attrs["name"]
-                version = attrs["version"]
+                version = int(attrs["version"])
             except KeyError as e:
                 raise XmlError.create(
                     f"Missing attribute {e} in element '{element}'",
@@ -559,7 +559,7 @@ class ProtocolParser(xml.sax.handler.ContentHandler):
                 )
             try:
                 name = attrs["name"]
-                since = attrs["since"]
+                since = int(attrs["since"])
             except KeyError as e:
                 raise XmlError.create(
                     f"Missing attribute {e} in element '{element}'",
@@ -612,7 +612,7 @@ class ProtocolParser(xml.sax.handler.ContentHandler):
 
             try:
                 name = attrs["name"]
-                since = attrs["since"]
+                since = int(attrs["since"])
             except KeyError as e:
                 raise XmlError.create(
                     f"Missing attribute {e} in element '{element}'",
@@ -646,7 +646,7 @@ class ProtocolParser(xml.sax.handler.ContentHandler):
                 )
             try:
                 name = attrs["name"]
-                since = attrs["since"]
+                since = int(attrs["since"])
             except KeyError as e:
                 raise XmlError.create(
                     f"Missing attribute {e} in element '{element}'",