diff --git a/freeglut/freeglut/CMakeLists.txt b/freeglut/freeglut/CMakeLists.txt
index 0c10a56..690f0ec 100644
--- a/freeglut/freeglut/CMakeLists.txt
+++ b/freeglut/freeglut/CMakeLists.txt
@@ -73,7 +73,7 @@ SET(FREEGLUT_HEADERS
     include/GL/freeglut_std.h
 )
 IF(FREEGLUT_REPLACE_GLUT)
-    LIST(APPEND FREEGLUT_SRCS
+    LIST(APPEND FREEGLUT_HEADERS
         include/GL/glut.h
     )
 ENDIF()