diff --git a/IPython/frontend/terminal/interactiveshell.py b/IPython/frontend/terminal/interactiveshell.py
index b9a5ef4..252d4ec 100644
--- a/IPython/frontend/terminal/interactiveshell.py
+++ b/IPython/frontend/terminal/interactiveshell.py
@@ -159,8 +159,10 @@ class TerminalMagics(Magics):
         else:
             self.shell.user_ns['pasted_block'] = b
             self.shell.using_paste_magics = True
-            self.shell.run_cell(b)
-            self.shell.using_paste_magics = True
+            try:
+                self.shell.run_cell(b)
+            finally:
+                self.shell.using_paste_magics = False
 
     def rerun_pasted(self, name='pasted_block'):
         """ Rerun a previously pasted command.