diff --git a/libavcodec/ac3enc.c b/libavcodec/ac3enc.c
index 5ec8b4f5ac..aac6a578fd 100644
--- a/libavcodec/ac3enc.c
+++ b/libavcodec/ac3enc.c
@@ -804,7 +804,7 @@ void ac3_common_init(void)
         for(j=0;j<v;j++) masktab[k++]=i;
         l += v;
     }
-    bndtab[50] = 0;
+    bndtab[50] = l;
 }
 
 
diff --git a/libavcodec/ac3tab.h b/libavcodec/ac3tab.h
index d8771fbeee..7232ca6a41 100644
--- a/libavcodec/ac3tab.h
+++ b/libavcodec/ac3tab.h
@@ -160,7 +160,7 @@ static const uint16_t dbkneetab[4]= {
     0x000, 0x700, 0x900, 0xb00,
 };
 
-static const uint16_t floortab[8]= {
+static const int16_t floortab[8]= {
     0x2f0, 0x2b0, 0x270, 0x230, 0x1f0, 0x170, 0x0f0, 0xf800,
 };