diff --git a/toxav/codec.c b/toxav/codec.c
index ae24a9762..4a12ffb29 100644
--- a/toxav/codec.c
+++ b/toxav/codec.c
@@ -383,7 +383,7 @@ void codec_terminate_session ( CodecState *cs )
     free(cs);
 }
 
-inline float calculate_sum_sq (int16_t *n, uint16_t k)
+static inline float calculate_sum_sq (int16_t *n, uint16_t k)
 {
     float result = 0;
     uint16_t i = 0;