diff --git a/libcsdr.c b/libcsdr.c
index 981c7b5..8fa53ee 100755
--- a/libcsdr.c
+++ b/libcsdr.c
@@ -2107,7 +2107,7 @@ void bpsk_costas_loop_cc(complexf* input, complexf* output, int input_size, bpsk
         else error = iof(output,i)*qof(output,i);
         s->dphase = error * s->alpha + s->iir_temp;
         s->iir_temp += error * s->beta;
-        fprintf(stderr, "  error = %f, dphase = %f, nco_phase = %f\n", error, s->dphase, s->nco_phase);
+        //fprintf(stderr, "  error = %f, dphase = %f, nco_phase = %f\n", error, s->dphase, s->nco_phase);
 
         //step NCO
         s->nco_phase += s->dphase;