diff --git a/packages/primeng/src/treeselect/treeselect.spec.ts b/packages/primeng/src/treeselect/treeselect.spec.ts
index 923182f75a3..94ea52494e5 100644
--- a/packages/primeng/src/treeselect/treeselect.spec.ts
+++ b/packages/primeng/src/treeselect/treeselect.spec.ts
@@ -1330,6 +1330,31 @@ describe('TreeSelect', () => {
             expect(treeSelectInstance.virtualScrollItemSize).toBe(32);
         });
 
+        it('should pass scrollHeight to tree when virtual scrolling is enabled', async () => {
+            testComponent.options = Array.from({ length: 50 }, (_, i) => ({
+                key: i.toString(),
+                label: `Node ${i}`,
+                data: `Data ${i}`
+            }));
+            testComponent.scrollHeight = '180px';
+            testComponent.virtualScroll = true;
+            testComponent.virtualScrollItemSize = 32;
+            testFixture.changeDetectorRef.markForCheck();
+            await testFixture.whenStable();
+            testFixture.detectChanges();
+
+            const treeSelectInstance = testFixture.debugElement.query(By.directive(TreeSelect)).componentInstance;
+            const dropdown = testFixture.debugElement.query(By.css('.p-treeselect-dropdown'));
+            dropdown.nativeElement.dispatchEvent(new MouseEvent('mousedown', { bubbles: true }));
+            await testFixture.whenStable();
+            testFixture.detectChanges();
+            await new Promise((resolve) => setTimeout(resolve));
+            await testFixture.whenStable();
+            testFixture.detectChanges();
+
+            expect(treeSelectInstance.treeViewChild?.scrollHeight).toBe('180px');
+        });
+
         it('should handle dynamic option updates', async () => {
             // Start with empty options
             testComponent.options = [];
diff --git a/packages/primeng/src/treeselect/treeselect.ts b/packages/primeng/src/treeselect/treeselect.ts
index 9d7b8c5e430..3edc2b60e92 100755
--- a/packages/primeng/src/treeselect/treeselect.ts
+++ b/packages/primeng/src/treeselect/treeselect.ts
@@ -165,6 +165,7 @@ const TREESELECT_INSTANCE = new InjectionToken<TreeSelect>('TREESELECT_INSTANCE'
                             [filterPlaceholder]="filterPlaceholder"
                             [filterLocale]="filterLocale"
                             [filteredNodes]="filteredNodes"
+                            [scrollHeight]="virtualScroll ? scrollHeight : undefined"
                             [virtualScroll]="virtualScroll"
                             [virtualScrollItemSize]="virtualScrollItemSize"
                             [virtualScrollOptions]="virtualScrollOptions"