diff --git a/ChangeLog b/ChangeLog
index eadbd7d91..aa182169e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2013-12-18  Vladimir Serbinenko  <phcoder@gmail.com>
+
+	Remove -Wold-style-definition.
+
+	Not very useful and interaction of it with regexp depends on GCC
+	version.
+
 2013-12-18  Vladimir Serbinenko  <phcoder@gmail.com>
 
 	Make grub_util_get_windows_path_real static.
diff --git a/configure.ac b/configure.ac
index dfb4f69ce..cc66ea912 100644
--- a/configure.ac
+++ b/configure.ac
@@ -433,7 +433,7 @@ esac
 gl_INIT
 
 WARN_FLAGS="-Wall -W -Wshadow -Wpointer-arith -Wundef -Wchar-subscripts -Wcomment -Wdeprecated-declarations -Wdisabled-optimization -Wdiv-by-zero -Wfloat-equal -Wformat-extra-args -Wformat-security -Wformat-y2k -Wimplicit -Wimplicit-function-declaration -Wimplicit-int -Wmain -Wmissing-braces -Wmissing-format-attribute -Wmultichar -Wparentheses -Wpointer-arith -Wreturn-type -Wsequence-point -Wshadow -Wsign-compare -Wswitch -Wtrigraphs -Wundef -Wunknown-pragmas -Wunused -Wunused-function -Wunused-label -Wunused-parameter -Wunused-value  -Wunused-variable -Wwrite-strings -Wnested-externs -Wstrict-prototypes"
-EXTRA_WARN_FLAGS="-Wold-style-definition -Wextra -Wattributes -Wendif-labels -Winit-self -Wint-to-pointer-cast -Winvalid-pch -Wmissing-field-initializers -Wnonnull -Woverflow -Wvla -Wpointer-to-int-cast -Wstrict-aliasing -Wvariadic-macros -Wvolatile-register-var -Wpointer-sign"
+EXTRA_WARN_FLAGS="-Wextra -Wattributes -Wendif-labels -Winit-self -Wint-to-pointer-cast -Winvalid-pch -Wmissing-field-initializers -Wnonnull -Woverflow -Wvla -Wpointer-to-int-cast -Wstrict-aliasing -Wvariadic-macros -Wvolatile-register-var -Wpointer-sign"
 
 HOST_CFLAGS="$HOST_CFLAGS $WARN_FLAGS -Wcast-align"