1 files changed, 2 insertions, 0 deletions
diff --git a/src/fsk.h b/src/fsk.h
index f77d39f..1b4dfdc 100644
--- a/src/fsk.h
+++ b/src/fsk.h
@@ -48,6 +48,8 @@ octave/fsk_horus.m
 #define FSK_DEFAULT_NSYM 50 /* See Nsym below */
 #define FSK_NONE -1         /* unused parameter */
 
+#undef P /* avoid clash with #define P in fdmdv_internal.h */
+
 struct FSK {
   /*  Static parameters set up by fsk_init */
   int Ndft; /* freq offset est fft */