1 files changed, 6 insertions, 2 deletions
diff --git a/lib/sqlalchemy/dialects/mysql/base.py b/lib/sqlalchemy/dialects/mysql/base.py
index 01f8b13a7..e0610ec7e 100644
--- a/lib/sqlalchemy/dialects/mysql/base.py
+++ b/lib/sqlalchemy/dialects/mysql/base.py
@@ -1318,10 +1318,14 @@ class MySQLDDLCompiler(compiler.DDLCompiler):
         default = self.get_column_default_string(column)
         if default is not None:
             colspec.append('DEFAULT ' + default)
-
-        if not column.nullable:
+        
+        is_timestamp = isinstance(column.type, sqltypes.TIMESTAMP)
+        if not column.nullable and not is_timestamp:
             colspec.append('NOT NULL')
 
+        elif column.nullable and is_timestamp and default is None:
+            colspec.append('NULL')
+
         if column.primary_key and column.autoincrement:
             try:
                 first = [c for c in column.table.primary_key.columns