diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9d7f26dce..9893021ae 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -341,6 +341,7 @@ set (wsjt_FSRCS
   lib/unpackgrid.f90
   lib/unpackmsg.f90
   lib/unpacktext.f90
+  lib/wavhdr.f90
   lib/zplot9.f90
   )