diff --git a/CMakeLists.txt b/CMakeLists.txt
index c37cb38..adffeeb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -40,6 +40,7 @@
     PRIVATE
         src/ieee754.c
         src/qcbor_decode.c
+        src/qcbor_spiffy_decode.c
         src/qcbor_tag_decode.c
         src/qcbor_number_decode.c
         src/qcbor_encode.c