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-rw-r--r--src/lowpass.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/lowpass.c b/src/lowpass.c
index 0ec53be..b0abda5 100644
--- a/src/lowpass.c
+++ b/src/lowpass.c
@@ -274,6 +274,7 @@ void prewarp(
double *a0, double *a1, double *a2,
double fc, double fs)
{
+ (void)a0;
double wp, pi;
pi = 4.0 * atan(1.0);