diff --git a/tests/hghave.py b/tests/hghave.py
--- a/tests/hghave.py
+++ b/tests/hghave.py
@@ -591,7 +591,7 @@ def has_pylint():
 
 @check("clang-format", "clang-format C code formatter")
 def has_clang_format():
-    m = matchoutput('clang-format --version', br'clang-format version (\d*)')
+    m = matchoutput('clang-format --version', br'clang-format version (\d+)')
     # style changed somewhere between 4.x and 6.x
     return m and int(m.group(1)) >= 6