diff --git a/src/data_scanner.cc b/src/data_scanner.cc
index 61d13736..f6d55984 100644
--- a/src/data_scanner.cc
+++ b/src/data_scanner.cc
@@ -59,7 +59,7 @@ static struct {
     { "time",    pcrepp(
           "\\A([\\s\\d]\\d:\\d\\d(?:(?!:\\d)|:\\d\\d(?:[\\.,]\\d{3,6})?Z?))\\b"), },
     /* { "qual", pcrepp("\\A([^\\s:=]+:[^\\s:=,]+(?!,)(?::[^\\s:=,]+)*)"), }, */
-    { "ipv6",    pcrepp("\\A(::|[:\\da-fA-f\\.]+[a-fA-f\\d](?:%\\w+)?)"), },
+    { "ipv6",    pcrepp("\\A(::|[:\\da-fA-F\\.]+[a-fA-F\\d](?:%\\w+)?)"), },
     { "hexd",    pcrepp(
           "\\A([0-9a-fA-F][0-9a-fA-F](?::[0-9a-fA-F][0-9a-fA-F])+)"), },