diff --git a/pydal/dialects/base.py b/pydal/dialects/base.py
index 6495145c8..fc3230bc9 100644
--- a/pydal/dialects/base.py
+++ b/pydal/dialects/base.py
@@ -379,7 +379,8 @@ def gte(self, first, second=None, query_env={}):
             self.expand(second, first.type, query_env=query_env))
 
     def _is_numerical(self, field_type):
-        return field_type in ('integer', 'boolean', 'double', 'bigint') or \
+        return field_type in \
+            ('integer', 'float', 'double', 'bigint', 'boolean') or \
             field_type.startswith('decimal')
 
     def add(self, first, second, query_env={}):