diff --git a/libavcodec/aacsbr_fixed.c b/libavcodec/aacsbr_fixed.c
index b4e3ac7f76..a56305746b 100644
--- a/libavcodec/aacsbr_fixed.c
+++ b/libavcodec/aacsbr_fixed.c
@@ -291,6 +291,8 @@ static void sbr_hf_inverse_filter(SBRDSPContext *dsp,
         shift = a00.exp;
         if (shift >= 3)
             alpha0[k][0] = 0x7fffffff;
+        else if (shift <= -30)
+            alpha0[k][0] = 0;
         else {
             a00.mant <<= 1;
             shift = 2-shift;
@@ -305,6 +307,8 @@ static void sbr_hf_inverse_filter(SBRDSPContext *dsp,
         shift = a01.exp;
         if (shift >= 3)
             alpha0[k][1] = 0x7fffffff;
+        else if (shift <= -30)
+            alpha0[k][1] = 0;
         else {
             a01.mant <<= 1;
             shift = 2-shift;
@@ -318,6 +322,8 @@ static void sbr_hf_inverse_filter(SBRDSPContext *dsp,
         shift = a10.exp;
         if (shift >= 3)
             alpha1[k][0] = 0x7fffffff;
+        else if (shift <= -30)
+            alpha1[k][0] = 0;
         else {
             a10.mant <<= 1;
             shift = 2-shift;
@@ -332,6 +338,8 @@ static void sbr_hf_inverse_filter(SBRDSPContext *dsp,
         shift = a11.exp;
         if (shift >= 3)
             alpha1[k][1] = 0x7fffffff;
+        else if (shift <= -30)
+            alpha1[k][1] = 0;
         else {
             a11.mant <<= 1;
             shift = 2-shift;