diff --git a/hwdb.d/parse_hwdb.py b/hwdb.d/parse_hwdb.py
index 0268bf9580..aef0331ace 100755
--- a/hwdb.d/parse_hwdb.py
+++ b/hwdb.d/parse_hwdb.py
@@ -121,7 +121,7 @@ def hwdb_grammar():
 def property_grammar():
     ParserElement.setDefaultWhitespaceChars(' ')
 
-    dpi_setting = Group(Optional('*')('DEFAULT') + INTEGER('DPI') + Suppress('@') + INTEGER('HZ'))('SETTINGS*')
+    dpi_setting = Group(Optional('*')('DEFAULT') + INTEGER('DPI') + Optional(Suppress('@') + INTEGER('HZ')))('SETTINGS*')
     mount_matrix_row = SIGNED_REAL + ',' + SIGNED_REAL + ',' + SIGNED_REAL
     mount_matrix = Group(mount_matrix_row + ';' + mount_matrix_row + ';' + mount_matrix_row)('MOUNT_MATRIX')
     xkb_setting = Optional(Word(alphanums + '+-/@._'))