diff --git a/src/Progressable.php b/src/Progressable.php
index 389fd98..f3cd5c0 100644
--- a/src/Progressable.php
+++ b/src/Progressable.php
@@ -252,7 +252,19 @@ public function isComplete(): bool {
      * Check if the overall progress is complete (100%).
      */
     public function isOverallComplete(): bool {
-        return $this->getOverallProgress(0) >= 100;
+        $progressData = $this->getOverallProgressData();
+
+        if (empty($progressData)) {
+            return false;
+        }
+
+        foreach ($progressData as $data) {
+            if (($data['progress'] ?? 0) < 100) {
+                return false;
+            }
+        }
+
+        return true;
     }
 
     /**
diff --git a/tests/IsOverallCompleteBugTest.php b/tests/IsOverallCompleteBugTest.php
new file mode 100644
index 0000000..601ad79
--- /dev/null
+++ b/tests/IsOverallCompleteBugTest.php
@@ -0,0 +1,33 @@
+<?php
+namespace Verseles\Progressable\Tests;
+
+use Verseles\Progressable\Progressable;
+use Orchestra\Testbench\TestCase;
+
+class DummyProgressableOverallComplete
+{
+    use Progressable;
+}
+
+class IsOverallCompleteBugTest extends TestCase
+{
+    public function testIsOverallCompleteIsAccurateAndDoesNotReturnTruePrematurely()
+    {
+        $a = new DummyProgressableOverallComplete();
+        $a->setOverallUniqueName('test-overall-complete-bug');
+        $a->setLocalKey('a');
+        $a->setLocalProgress(100);
+
+        $b = new DummyProgressableOverallComplete();
+        $b->setOverallUniqueName('test-overall-complete-bug');
+        $b->setLocalKey('b');
+        $b->setLocalProgress(99.4);
+
+        // Before the fix, this evaluates to true because getOverallProgress(0) rounds 99.7 to 100.
+        $this->assertFalse($a->isOverallComplete(), 'isOverallComplete should return false when not all processes are 100% complete.');
+
+        $b->setLocalProgress(100);
+
+        $this->assertTrue($a->isOverallComplete(), 'isOverallComplete should return true when all processes are 100% complete.');
+    }
+}