diff --git a/contrib/check-code.py b/contrib/check-code.py
--- a/contrib/check-code.py
+++ b/contrib/check-code.py
@@ -263,8 +263,6 @@
     (r'.{81}', "line too long"),
     (r'[^\n]\Z', "no trailing newline"),
     (r'(\S[ \t]+|^[ \t]+)\n', "trailing whitespace"),
-#    (r'^\s+[^_ \n][^_. \n]+_[^_\n]+\s*=',
-#     "don't use underbars in identifiers"),
     (r'^\s+(self\.)?[A-Za-z][a-z0-9]+[A-Z]\w* = ',
      "don't use camelcase in identifiers", r'#.*camelcase-required'),
     (r'^\s*(if|while|def|class|except|try)\s[^[\n]*:\s*[^\\n]#\s]+',
diff --git a/contrib/check-commit b/contrib/check-commit
--- a/contrib/check-commit
+++ b/contrib/check-commit
@@ -41,12 +41,6 @@
     (afterheader + r".{79,}", "summary line too long (limit is 78)"),
     (r"\n\+\n( |\+)\n", "adds double empty line"),
     (r"\n \n\+\n", "adds double empty line"),
-    # Forbid "_" in function name.
-    #
-    # We skip the check for cffi related functions. They use names mapping the
-    # name of the C function. C function names may contain "_".
-    (r"\n\+[ \t]+def (?!cffi)[a-z]+_[a-z]",
-     "adds a function with foo_bar naming"),
 ]
 
 word = re.compile('\S')
diff --git a/tests/test-contrib-check-commit.t b/tests/test-contrib-check-commit.t
--- a/tests/test-contrib-check-commit.t
+++ b/tests/test-contrib-check-commit.t
@@ -132,8 +132,6 @@
    This has no topic and ends with a period.
   19: adds double empty line
    +
-  20: adds a function with foo_bar naming
-   + def blah_blah(x):
   23: adds double empty line
    +
   [1]