diff --git a/src/data.cpp b/src/data.cpp
index 0b185737..6b31beee 100644
--- a/src/data.cpp
+++ b/src/data.cpp
@@ -577,6 +577,25 @@ std::vector <Interval> getTrackedIntervals (
   return intervals;
 }
 
+////////////////////////////////////////////////////////////////////////////////
+// Untracked time is that which is not excluded, and not filled. Gaps.
+std::vector <Range> getUntrackedRanges (
+  const Rules& rules)
+{
+  std::vector <Range> gaps;
+
+  // Get the set of expanded exclusions that overlap the range defined by the
+  // timeline. If no range is defined, derive it from the set of all data.
+/*
+  auto exclusions = getExcludedRanges (rules);
+*/
+
+  // TODO subtract all exclusions
+  // TODO subtract all inclusions
+
+  return gaps;
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 Interval getLatestInterval (Database& database)
 {
diff --git a/src/helper.cpp b/src/helper.cpp
index 38e0e039..c5adfe55 100644
--- a/src/helper.cpp
+++ b/src/helper.cpp
@@ -133,24 +133,6 @@ std::vector <Range> getExcludedRanges (Rules& rules, Range& range)
   return getAllExclusions (rules, overallRange);
 }
 */
-////////////////////////////////////////////////////////////////////////////////
-// Untracked time is that which is not excluded, and not filled. Gaps.
-std::vector <Range> getUntrackedRanges (Rules& rules)
-{
-  std::vector <Range> gaps;
-
-  // Get the set of expanded exclusions that overlap the range defined by the
-  // timeline. If no range is defined, derive it from the set of all data.
-/*
-  auto exclusions = getExcludedRanges (rules);
-*/
-
-  // TODO subtract all exclusions
-  // TODO subtract all inclusions
-
-  return gaps;
-}
-
 ////////////////////////////////////////////////////////////////////////////////
 // Compose a JSON document of intervals. In the trivial case:
 //   [
diff --git a/src/timew.h b/src/timew.h
index de7632a9..930cab1f 100644
--- a/src/timew.h
+++ b/src/timew.h
@@ -52,6 +52,7 @@ Range                   outerRange          (const std::vector <Interval>&);
 bool                    matchesFilter       (const Interval&, const Interval&);
 Interval                clip                (const Interval&, const Range&);
 std::vector <Interval>  getTrackedIntervals (Database&, const Rules&, Interval&);
+std::vector <Range>     getUntrackedRanges  (const Rules&);
 Interval                getLatestInterval   (Database&);
 
 // init.cpp
@@ -66,7 +67,6 @@ Color tagColor (const Rules&, const std::string&);
 std::string intervalSummarize (const Rules&, const Interval&);
 bool expandIntervalHint (const std::string&, std::string&, std::string&);
 std::vector <Range> getExcludedRanges (Rules&, Range&);
-std::vector <Range> getUntrackedRanges (Rules&);
 std::string jsonFromIntervals (const std::vector <Interval>&);
 Palette createPalette (const Rules&);
 std::map <std::string, Color> createTagColorMap (const Rules&, Palette&, const std::vector <Interval>&);