diff --git a/src/stats/zoneDistribution.test.ts b/src/stats/zoneDistribution.test.ts
index 9660d0a..837a092 100644
--- a/src/stats/zoneDistribution.test.ts
+++ b/src/stats/zoneDistribution.test.ts
@@ -1,6 +1,6 @@
 import { Interval } from "../ast";
 import { Duration } from "../Duration";
-import { ConstantIntensity, RangeIntensity } from "../Intensity";
+import { ConstantIntensity, FreeIntensity, RangeIntensity } from "../Intensity";
 import { zoneDistribution } from "./zoneDistribution";
 
 const testZoneDistribution = (intervals: Interval[]) =>
@@ -102,4 +102,24 @@ describe("zoneDistribution()", () => {
       ["Freeride", 0],
     ]);
   });
+
+  it("places free-intensity duration to special free-zone", () => {
+    const intervals: Interval[] = [
+      {
+        type: "Interval",
+        duration: new Duration(60),
+        intensity: new FreeIntensity(),
+        comments: [],
+      },
+    ];
+    expect(testZoneDistribution(intervals)).toEqual([
+      ["Z1: Recovery", 0],
+      ["Z2: Endurance", 0],
+      ["Z3: Tempo", 0],
+      ["Z4: Threshold", 0],
+      ["Z5: VO2 Max", 0],
+      ["Z6: Anaerobic", 0],
+      ["Freeride", 60],
+    ]);
+  });
 });
diff --git a/src/stats/zoneDistribution.ts b/src/stats/zoneDistribution.ts
index 5e68741..53a15bd 100644
--- a/src/stats/zoneDistribution.ts
+++ b/src/stats/zoneDistribution.ts
@@ -1,5 +1,6 @@
 import { Interval } from "../ast";
 import { Duration } from "../Duration";
+import { RangeIntensity } from "../Intensity";
 import { intensityValueToZoneType, ZoneType } from "../ZoneType";
 import { intervalsToIntensityNumbers } from "./intervalsToIntensityNumbers";
 
@@ -19,8 +20,14 @@ const emptyZones = (): Record<ZoneType, NumericZoneDuration> => ({
 export const zoneDistribution = (intervals: Interval[]): ZoneDuration[] => {
   const zones = emptyZones();
 
-  intervalsToIntensityNumbers(intervals).forEach((intensity) => {
-    zones[intensityValueToZoneType(intensity)].duration++;
+  intervals.forEach((interval) => {
+    if (interval.intensity instanceof RangeIntensity) {
+      intervalsToIntensityNumbers([interval]).forEach((intensityValue) => {
+        zones[intensityValueToZoneType(intensityValue)].duration++;
+      });
+    } else {
+      zones[interval.intensity.zone].duration += interval.duration.seconds;
+    }
   });
 
   return Object.values(zones).map(({ duration, ...rest }) => ({ duration: new Duration(duration), ...rest }));
diff --git a/test/__snapshots__/cli.test.ts.snap b/test/__snapshots__/cli.test.ts.snap
index 211ddd1..6284895 100644
--- a/test/__snapshots__/cli.test.ts.snap
+++ b/test/__snapshots__/cli.test.ts.snap
@@ -288,13 +288,13 @@ Normalized intensity: 71%
 TSS: 37
 
 Zone Distribution:
- 35 min - Z1: Recovery
+ 15 min - Z1: Recovery
   4 min - Z2: Endurance
   0 min - Z3: Tempo
   0 min - Z4: Threshold
   3 min - Z5: VO2 Max
   2 min - Z6: Anaerobic
-  0 min - Freeride
+ 20 min - Freeride
 "
 `;