diff --git a/simgear/sound/CMakeLists.txt b/simgear/sound/CMakeLists.txt
index b284d736..884e9520 100644
--- a/simgear/sound/CMakeLists.txt
+++ b/simgear/sound/CMakeLists.txt
@@ -6,6 +6,7 @@ set(HEADERS
     xmlsound.hxx
     soundmgr.hxx
     filters.hxx
+    readwav.hxx
     )
     
 set(SOURCES 
@@ -13,6 +14,7 @@ set(SOURCES
     sample_group.cxx
     xmlsound.cxx
     filters.cxx
+    readwav.cxx
     )
 
 if (USE_AEONWAVE)
@@ -20,13 +22,9 @@ if (USE_AEONWAVE)
         soundmgr_aeonwave.cxx
         )
 else()
-    set(HEADERS ${HEADERS}
-        readwav.hxx
-        )
     set(SOURCES ${SOURCES}
         soundmgr_openal.cxx
         soundmgr_openal_private.hxx
-        readwav.cxx
         )
 endif()