diff --git a/silk/tests/test_unit_LPC_inv_pred_gain.c b/silk/tests/test_unit_LPC_inv_pred_gain.c
index dcc61bd8817ddba7a64d96b6c70d7bd3d5c6c0d6..67067cead70297fe77361ae555aa9bc304b87ff6 100644
--- a/silk/tests/test_unit_LPC_inv_pred_gain.c
+++ b/silk/tests/test_unit_LPC_inv_pred_gain.c
@@ -77,7 +77,7 @@ int check_stability(opus_int16 *A_Q12, int order) {
         if( ( i & 0x7 ) == 0 ) {
             double amp = 0;
             for( j = 0; j < order; j++ ) {
-                amp += fabs(y[0]);
+                amp += fabs(y[j]);
             }
             if( amp < 0.00001 ) {
                 return 1;