diff --git a/plugin/UltiSnips/__init__.py b/plugin/UltiSnips/__init__.py
index ba1eb15..7048b93 100644
--- a/plugin/UltiSnips/__init__.py
+++ b/plugin/UltiSnips/__init__.py
@@ -334,6 +334,7 @@ class Snippet(object):
         self._matched = ""
 
         # Don't expand on whitespace
+        trigger = trigger.lstrip()
         if trigger and trigger.rstrip() is not trigger:
             return False
 
diff --git a/test.py b/test.py
index dd3aec6..f7204dd 100755
--- a/test.py
+++ b/test.py
@@ -1808,6 +1808,9 @@ class _ListAllSnippets(_VimTest):
 class ListAllAvailable_NothingTyped_ExceptCorrectResult(_ListAllSnippets):
     keys = "" + LS + "3\n"
     wanted = "BLAAH"
+class ListAllAvailable_SpaceInFront_ExceptCorrectResult(_ListAllSnippets):
+    keys = " " + LS + "3\n"
+    wanted = " BLAAH"
 class ListAllAvailable_testtyped_ExceptCorrectResult(_ListAllSnippets):
     keys = "hallo test" + LS + "2\n"
     wanted = "hallo BLAAH"