Fix wrong `set()` member deletion in `MibBuilder`

1 files changed, 2 insertions, 2 deletions

diff --git a/pysnmp/smi/builder.py b/pysnmp/smi/builder.py
index a622d140..1a1f2e8f 100644
--- a/pysnmp/smi/builder.py
+++ b/pysnmp/smi/builder.py
@@ -331,7 +331,7 @@ class MibBuilder(object):
                 exec(compile(modData, modPath, 'exec'), g)
 
             except Exception:
-                del self.__modPathsSeen[modPath]
+                self.__modPathsSeen.remove(modPath)
                 raise error.MibLoadError(
                     'MIB module \'%s\' load error: %s' % (modPath, traceback.format_exception(*sys.exc_info()))
                 )
@@ -388,7 +388,7 @@ class MibBuilder(object):
                     'No module %s at %s' % (modName, self)
                 )
             self.unexportSymbols(modName)
-            del self.__modPathsSeen[self.__modSeen[modName]]
+            self.__modPathsSeen.remove(self.__modSeen[modName])
             del self.__modSeen[modName]
 
             debug.logger & debug.flagBld and debug.logger('unloadModules: %s' % modName)