diff --git a/lib/c/experimental/labcomm_sig_parser.c b/lib/c/experimental/labcomm_sig_parser.c
index d4802aa05b3b467ed8b16f12d12763cc29e983e2..bdda6caf74dccff30bafa53e7bb6052ab5dd0a9c 100644
--- a/lib/c/experimental/labcomm_sig_parser.c
+++ b/lib/c/experimental/labcomm_sig_parser.c
@@ -35,7 +35,7 @@
 
 #undef EXIT_WHEN_RECEIVING_DATA 
 
-#define RETURN_STRINGS  // highly experimental, and not used
+#undef RETURN_STRINGS  // highly experimental, and not used
 
 #ifndef TRUE