diff --git a/libavutil/tests/pca.c b/libavutil/tests/pca.c
index 2d9eb8f56a..b2afbea3b5 100644
--- a/libavutil/tests/pca.c
+++ b/libavutil/tests/pca.c
@@ -40,14 +40,14 @@ int main(void){
 
     for(i=0; i<9000000; i++){
         double v[2*LEN+100];
-        double sum=0;
+//        double sum=0;
         int pos = av_lfg_get(&prng) % LEN;
         int v2  = av_lfg_get(&prng) % 101 - 50;
         v[0]    = av_lfg_get(&prng) % 101 - 50;
         for(j=1; j<8; j++){
             if(j<=pos) v[j]= v[0];
             else       v[j]= v2;
-            sum += v[j];
+//            sum += v[j];
         }
 /*        for(j=0; j<LEN; j++){
             v[j] -= v[pos];