diff --git a/build.cmd b/build.cmd
index a60c68b..74d4cb1 100644
--- a/build.cmd
+++ b/build.cmd
@@ -2,7 +2,7 @@
 
 call "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\Common7\Tools\VsDevCmd.bat" -arch=amd64 -host_arch=amd64
 
-set CL=/nologo /errorReport:none /Gm- /GF /GS- /MT /W4
+set CL=/nologo /errorReport:none /Gm- /GF /GS- /MT /W4 /wd4324
 set LINK=/errorReport:none /INCREMENTAL:NO
 
 set CL=%CL% /Ox
diff --git a/puff.c b/puff.c
index 4ebc6ac..56e99f2 100644
--- a/puff.c
+++ b/puff.c
@@ -174,7 +174,7 @@ local int construct(struct huffman *h, const short *length, int n)
      */
     for (symbol = 0; symbol < n; symbol++)
         if (length[symbol] != 0)
-            h->symbol[offs[length[symbol]]++] = symbol;
+            h->symbol[offs[length[symbol]]++] = (short)symbol;
 
     /* return zero for complete set, positive for incomplete set */
     return left;
@@ -212,7 +212,7 @@ local int codes(struct state *s,
             if (s->out != NIL) {
                 if (s->outcnt == s->outlen)
                     return 1;
-                s->out[s->outcnt] = symbol;
+                s->out[s->outcnt] = (unsigned char)symbol;
             }
             s->outcnt++;
         }
@@ -325,7 +325,7 @@ local int dynamic(struct state *s)
 
     /* read code length code lengths (really), missing lengths are zero */
     for (index = 0; index < ncode; index++)
-        lengths[order[index]] = bits(s, 3);
+        lengths[order[index]] = (short)bits(s, 3);
     for (; index < 19; index++)
         lengths[order[index]] = 0;
 
@@ -344,7 +344,7 @@ local int dynamic(struct state *s)
         if (symbol < 0)
             return symbol;          /* invalid symbol */
         if (symbol < 16)                /* length in 0..15 */
-            lengths[index++] = symbol;
+            lengths[index++] = (short)symbol;
         else {                          /* repeat instruction */
             len = 0;                    /* assume repeating zeros */
             if (symbol == 16) {         /* repeat last length 3..6 times */
@@ -360,7 +360,7 @@ local int dynamic(struct state *s)
             if (index + symbol > nlen + ndist)
                 return -6;              /* too many lengths! */
             while (symbol--)            /* repeat last or zero symbol times */
-                lengths[index++] = len;
+                lengths[index++] = (short)len;
         }
     }