diff --git a/salt/roster/range.py b/salt/roster/range.py
index 0633d56e389..247fb51ced6 100644
--- a/salt/roster/range.py
+++ b/salt/roster/range.py
@@ -15,16 +15,21 @@
 import fnmatch
 import logging
 
+import salt.loader
+
 log = logging.getLogger(__name__)
 
 # Try to import range from https://github.com/ytoolshed/range
 HAS_RANGE = False
 try:
+    salt.loader.LOAD_LOCK.acquire()
     import seco.range
 
     HAS_RANGE = True
 except ImportError:
     log.warning("Unable to load range library")
+finally:
+    salt.loader.LOAD_LOCK.release()
 # pylint: enable=import-error
 
 
diff --git a/salt/utils/roster_matcher.py b/salt/utils/roster_matcher.py
index c424c63bb0e..39e57f78f17 100644
--- a/salt/utils/roster_matcher.py
+++ b/salt/utils/roster_matcher.py
@@ -8,14 +8,19 @@
 import logging
 import re
 
+import salt.loader
+
 # Try to import range from https://github.com/ytoolshed/range
 HAS_RANGE = False
 try:
+    salt.loader.LOAD_LOCK.acquire()
     import seco.range
 
     HAS_RANGE = True
 except ImportError:
     pass
+finally:
+    salt.loader.LOAD_LOCK.release()
 # pylint: enable=import-error