diff --git a/intern/guardedalloc/CMakeLists.txt b/intern/guardedalloc/CMakeLists.txt
index b7a59da7813..1d041ba5380 100644
--- a/intern/guardedalloc/CMakeLists.txt
+++ b/intern/guardedalloc/CMakeLists.txt
@@ -39,6 +39,9 @@ set(SRC
 
 	MEM_guardedalloc.h
 	./intern/mallocn_intern.h
+
+	# only so the header is known by cmake
+	../atomic/atomic_ops.h
 )
 
 if(WIN32 AND NOT UNIX)