diff --git a/gitinspector/blame.py b/gitinspector/blame.py
index 8580fe9..130c4be 100644
--- a/gitinspector/blame.py
+++ b/gitinspector/blame.py
@@ -26,7 +26,7 @@ import subprocess
 import threading
 from .localization import N_
 from .changes import FileDiff
-from . import comment, filtering, format, interval, terminal
+from . import comment, extensions, filtering, format, interval, terminal
 
 NUM_THREADS = multiprocessing.cpu_count()
 
@@ -137,11 +137,13 @@ class Blame(object):
 			row = row.encode("latin-1", "replace")
 			row = row.decode("utf-8", "replace").strip("\"").strip("'").strip()
 
-			if FileDiff.is_valid_extension(row) and not filtering.set_filtered(FileDiff.get_filename(row)):
+			if FileDiff.get_extension(row) in extensions.get_located() and not \
+			   filtering.set_filtered(FileDiff.get_filename(row)):
 				blame_command = filter(None, ["git", "blame", "--line-porcelain", "-w"] + \
 						(["-C", "-C", "-M"] if hard else []) +
 				                [interval.get_since(), interval.get_ref(), "--", row])
-				thread = BlameThread(useweeks, changes, blame_command, FileDiff.get_extension(row), self.blames, row.strip())
+				thread = BlameThread(useweeks, changes, blame_command, FileDiff.get_extension(row),
+				                     self.blames, row.strip())
 				thread.daemon = True
 				thread.start()
 
diff --git a/gitinspector/extensions.py b/gitinspector/extensions.py
index f565494..3764735 100644
--- a/gitinspector/extensions.py
+++ b/gitinspector/extensions.py
@@ -36,3 +36,6 @@ def add_located(string):
 		__located_extensions__.add("*")
 	else:
 		__located_extensions__.add(string)
+
+def get_located():
+	return __located_extensions__