diff --git a/libavcodec/lpc.h b/libavcodec/lpc.h
index 182adfa8ca..88ca247f87 100644
--- a/libavcodec/lpc.h
+++ b/libavcodec/lpc.h
@@ -117,11 +117,14 @@ void ff_lpc_end(LPCContext *s);
 
 #if USE_FIXED
 typedef int LPC_TYPE;
+typedef unsigned LPC_TYPE_U;
 #else
 #ifdef LPC_USE_DOUBLE
 typedef double LPC_TYPE;
+typedef double LPC_TYPE_U;
 #else
 typedef float LPC_TYPE;
+typedef float LPC_TYPE_U;
 #endif
 #endif // USE_FIXED
 
@@ -192,8 +195,8 @@ static inline int AAC_RENAME(compute_lpc_coefs)(const LPC_TYPE *autoc, int max_o
         for(j=0; j < (i+1)>>1; j++) {
             LPC_TYPE f = lpc_last[    j];
             LPC_TYPE b = lpc_last[i-1-j];
-            lpc[    j] = f + AAC_MUL26(r, b);
-            lpc[i-1-j] = b + AAC_MUL26(r, f);
+            lpc[    j] = f + (LPC_TYPE_U)AAC_MUL26(r, b);
+            lpc[i-1-j] = b + (LPC_TYPE_U)AAC_MUL26(r, f);
         }
 
         if (fail && err < 0)