diff --git a/binprot.c b/binprot.c
index e07992e6..9313230d 100644
--- a/binprot.c
+++ b/binprot.c
@@ -1,5 +1,6 @@
 #include <ctype.h>
 #include <math.h>
+#include <stdint.h>
 #include "ascon.h"
 #include "ascon.i"
 #include "dynstring.h"
@@ -398,7 +399,7 @@ int BinHandler(Ascon *a) {
   int valen;
   BinDataType type;
   long iValue;
-  unsigned long uValue;
+  uint32_t uValue;
   double fValue;
   BinPrivate *p = a->private;
 
@@ -664,7 +665,7 @@ int BinHandler(Ascon *a) {
       p->expectedChars--;
       p->iValue = p->iValue * 256 + (a->lastChar & 255);
       if (p->expectedChars <= 0) {
-        snprintf(item, sizeof item, "%ld ", p->iValue);
+        snprintf(item, sizeof item, "%d ", (int32_t)p->iValue);
         DynStringConcat(p->result, item);
       }
       break;