diff --git a/src/Rules.cpp b/src/Rules.cpp
index 2d341a5d..b887470a 100644
--- a/src/Rules.cpp
+++ b/src/Rules.cpp
@@ -45,7 +45,7 @@ Rules::Rules ()
     {"verbose",                "on"},
 
     // 'day' report.
-    {"reports.day.24h",        "yes"},
+    {"reports.day.hours",      "all"},
     {"reports.day.lines",      "2"},
     {"reports.day.spacing",    "1"},
     {"reports.day.month",      "no"},
@@ -57,7 +57,7 @@ Rules::Rules ()
     {"reports.day.holidays",   "no"},
 
     // 'week' report.
-    {"reports.week.24h",       "yes"},
+    {"reports.week.hours",     "all"},
     {"reports.week.lines",     "1"},
     {"reports.week.spacing",   "1"},
     {"reports.week.month",     "no"},
@@ -69,7 +69,7 @@ Rules::Rules ()
     {"reports.week.holidays",  "yes"},
 
     // 'month' report.
-    {"reports.month.24h",      "yes"},
+    {"reports.month.hours",    "all"},
     {"reports.month.lines",    "1"},
     {"reports.month.spacing",  "1"},
     {"reports.month.month",    "yes"},
diff --git a/src/commands/CmdChart.cpp b/src/commands/CmdChart.cpp
index 472c66ec..a13b9141 100644
--- a/src/commands/CmdChart.cpp
+++ b/src/commands/CmdChart.cpp
@@ -219,7 +219,7 @@ static void determineHourRange (
   int& first_hour,
   int& last_hour)
 {
-  if (! rules.getBoolean ("reports." + type + ".24h"))
+  if (rules.getBoolean ("reports." + type + ".hours") == "auto")
   {
     // Get the extreme time range for the filtered data.
     first_hour = 23;