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-rw-r--r--gr-blocks/lib/control_loop.cc4
1 files changed, 2 insertions, 2 deletions
diff --git a/gr-blocks/lib/control_loop.cc b/gr-blocks/lib/control_loop.cc
index 7104e7439e..30260b5646 100644
--- a/gr-blocks/lib/control_loop.cc
+++ b/gr-blocks/lib/control_loop.cc
@@ -1,6 +1,6 @@
/* -*- c++ -*- */
/*
- * Copyright 2011,2013 Free Software Foundation, Inc.
+ * Copyright 2011,2013,2018 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
@@ -31,7 +31,7 @@
namespace gr {
namespace blocks {
-#define M_TWOPI (2.0f*M_PI)
+#define M_TWOPI (2.0f*GR_M_PI)
control_loop::control_loop(float loop_bw,
float max_freq, float min_freq)