diff --git a/tools/warn.py b/tools/warn.py
index f118263bed..3a8ae664f8 100755
--- a/tools/warn.py
+++ b/tools/warn.py
@@ -1508,7 +1508,7 @@ warnpatterns = [
     { 'category':'C/C++',   'severity':severity.MEDIUM,   'members':[], 'option':'-Wconversion',
         'description':'Conversion may change value',
         'patterns':[r".*: warning: converting negative value '.+' to '.+'",
-                    r".*: warning: conversion to '.+' .+ may alter its value"] },
+                    r".*: warning: conversion to '.+' .+ may (alter|change)"] },
     { 'category':'C/C++',   'severity':severity.MEDIUM,   'members':[], 'option':'-Wconversion-null',
         'description':'Converting to non-pointer type from NULL',
         'patterns':[r".*: warning: converting to non-pointer type '.+' from NULL"] },
@@ -1551,9 +1551,6 @@ warnpatterns = [
     { 'category':'C/C++',   'severity':severity.HIGH,     'members':[], 'option':'-Wextra',
         'description':'Base should be explicitly initialized in copy constructor',
         'patterns':[r".*: warning: base class '.+' should be explicitly initialized in the copy constructor"] },
-    { 'category':'C/C++',   'severity':severity.MEDIUM,     'members':[], 'option':'',
-        'description':'Converting from <type> to <other type>',
-        'patterns':[r".*: warning: converting to '.+' from '.+'"] },
     { 'category':'C/C++',   'severity':severity.MEDIUM,     'members':[], 'option':'',
         'description':'VLA has zero or negative size',
         'patterns':[r".*: warning: Declared variable-length array \(VLA\) has .+ size"] },