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-rw-r--r--src/post/audio/upmix.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/post/audio/upmix.c b/src/post/audio/upmix.c
index 76c9afe58..975d8b79e 100644
--- a/src/post/audio/upmix.c
+++ b/src/post/audio/upmix.c
@@ -57,7 +57,7 @@ typedef struct{
} biquad_t;
/* S-parameters for designing 4th order Butterworth filter */
-static biquad_t s_param[2] = {{{1.0,0.0,0.0},{1.0,0.765367,1.0}},
+static const biquad_t s_param[2] = {{{1.0,0.0,0.0},{1.0,0.765367,1.0}},
{{1.0,0.0,0.0},{1.0,1.847759,1.0}}};
/* Data for specific instances of this filter */