diff --git a/austin/stats.py b/austin/stats.py
index f1d64cc..72614db 100644
--- a/austin/stats.py
+++ b/austin/stats.py
@@ -270,8 +270,11 @@ def update(self, sample: AustinSample) -> None:
         by using :func:`Sample.parse` on a sample string passed by Austin to
         the sample callback.
         """
-        if self.stats_type in {AustinStatsType.WALL, AustinStatsType.CPU}:
+        if self.stats_type is AustinStatsType.WALL:
             metric = sample.metrics.time
+        elif self.stats_type is AustinStatsType.CPU:
+            # In full mode, idle samples contribute wall time but no CPU time
+            metric = None if sample.idle else sample.metrics.time
         elif (
             self.stats_type is AustinStatsType.MEMORY_ALLOC
             and sample.metrics.memory is not None
diff --git a/test/stats/test_austin_stats.py b/test/stats/test_austin_stats.py
index 3f18deb..19313d7 100644
--- a/test/stats/test_austin_stats.py
+++ b/test/stats/test_austin_stats.py
@@ -25,6 +25,7 @@
 from copy import deepcopy
 
 from austin.events import AustinFrame
+from austin.events import AustinMetadata
 from austin.events import AustinMetrics
 from austin.events import AustinSample
 from austin.format.collapsed_stack import AustinFileReader
@@ -348,3 +349,39 @@ def test_deepcopy():
     cloned_stats = deepcopy(stats)
     assert cloned_stats == stats
     assert cloned_stats is not stats
+
+
+def test_load_full_mode_cpu_excludes_idle():
+    frames = (AustinFrame("foo_module.py", "foo", 10),)
+    stats = AustinStats.load(
+        iter(
+            [
+                AustinMetadata("mode", "full"),
+                AustinSample(
+                    pid=42,
+                    iid=0,
+                    thread="0x7f45645646",
+                    metrics=AustinMetrics(time=100, memory=10),
+                    frames=frames,
+                    idle=False,
+                ),
+                AustinSample(
+                    pid=42,
+                    iid=0,
+                    thread="0x7f45645646",
+                    metrics=AustinMetrics(time=900, memory=-5),
+                    frames=frames,
+                    idle=True,
+                ),
+            ]
+        )
+    )
+
+    def total(stats_type: AustinStatsType) -> int:
+        thread_info = ThreadInfo("0x7f45645646", 0)
+        return stats[stats_type].processes[42].threads[thread_info].total
+
+    assert total(AustinStatsType.CPU) == 100
+    assert total(AustinStatsType.WALL) == 1000
+    assert total(AustinStatsType.MEMORY_ALLOC) == 10
+    assert total(AustinStatsType.MEMORY_DEALLOC) == 5