diff --git a/src/host/pico_stdio/CMakeLists.txt b/src/host/pico_stdio/CMakeLists.txt
index 82a31483187023ef58a7152c41de6376f3c58521..e05bfb9181b8f7f8a91d0c11506c4e3b7c30ee0a 100644
--- a/src/host/pico_stdio/CMakeLists.txt
+++ b/src/host/pico_stdio/CMakeLists.txt
@@ -16,5 +16,7 @@ if (NOT TARGET pico_stdio)
     endfunction()
     function(pico_enable_stdio_semihosting)
     endfunction()
+    function(pico_enable_stdio_rtt)
+    endfunction()
 endif()