diff --git a/ext-profiler/example/nccl/profiler.h b/ext-profiler/example/nccl/profiler.h
index 715885f72..6db5b7f7b 100644
--- a/ext-profiler/example/nccl/profiler.h
+++ b/ext-profiler/example/nccl/profiler.h
@@ -11,6 +11,7 @@
 #include <stdlib.h>
 
 #include "common.h"
+#include "err.h"
 
 enum {
   ncclProfileGroup          = (1 << 0),  // group event type