diff --git a/grc_tests/test_bpsk_costas_loop.grc b/grc_tests/test_bpsk_costas_loop.grc
index b8d1183..bb240e3 100644
--- a/grc_tests/test_bpsk_costas_loop.grc
+++ b/grc_tests/test_bpsk_costas_loop.grc
@@ -693,7 +693,7 @@
     </param>
     <param>
       <key>commandline</key>
-      <value>csdr bpsk_costas_loop_cc $(csdr =2*pi/100) 0.707 300 --dd 2&gt;/tmp/cout</value>
+      <value>csdr bpsk_costas_loop_cc $(csdr =2*pi/100) 0.707 5 2&gt;/tmp/cout</value>
     </param>
     <param>
       <key>comment</key>
diff --git a/libcsdr.c b/libcsdr.c
index 436c589..5cb67d7 100755
--- a/libcsdr.c
+++ b/libcsdr.c
@@ -2083,7 +2083,7 @@ void bpsk_costas_loop_cc(complexf* input, complexf* output, int input_size, bpsk
     for(int i=0;i<input_size;i++)
     {
         complexf nco_sample;
-        e_powj(&nco_sample, -s->nco_phase);
+        e_powj(&nco_sample, s->nco_phase);
         cmult(&output[i], &input[i], &nco_sample);
         float error = 0;
         if(s->decision_directed)