diff --git a/src/apps/activitymonitor/ActivityView.cpp b/src/apps/activitymonitor/ActivityView.cpp
index d86deea61d..fddf1fc3c6 100644
--- a/src/apps/activitymonitor/ActivityView.cpp
+++ b/src/apps/activitymonitor/ActivityView.cpp
@@ -9,7 +9,7 @@
 #include <new>
 #include <stdio.h>
 #include <stdlib.h>
-#include <vector.h>
+#include <vector>
 
 #ifdef __HAIKU__
 #	include <AbstractLayoutItem.h>