diff --git a/simgear/math/CMakeLists.txt b/simgear/math/CMakeLists.txt
index 71a61cea..d6bf513b 100644
--- a/simgear/math/CMakeLists.txt
+++ b/simgear/math/CMakeLists.txt
@@ -32,6 +32,7 @@ set(HEADERS
     sg_geodesy.hxx
     sg_types.hxx
     sg_random.h
+    simd.hxx
     )
 
 set(SOURCES