diff --git a/dns.c b/dns.c
index 3a74e1f..11dabfc 100644
--- a/dns.c
+++ b/dns.c
@@ -26,6 +26,7 @@
 #include <time.h>
 #include <err.h>
 #include <stdio.h>
+#include <stdint.h>
 #include <stdlib.h>
 #include <stdint.h>
 #include <unistd.h>
@@ -286,7 +287,7 @@ int
 dns_parse_reply(char *outbuf, int buflen, char *packet, int packetlen)
 {
 	int rv;
-	long ttl;
+	uint32_t ttl;
 	short rlen;
 	short type;
 	short class;
diff --git a/read.c b/read.c
index 832af41..1e40dba 100644
--- a/read.c
+++ b/read.c
@@ -15,7 +15,7 @@
  */
 
 #include <string.h>
-#include <stdio.h>
+#include <stdint.h>
 
 static int
 readname_loop(char *packet, int packetlen, char **src, char *dst, size_t length, size_t loop)
@@ -95,19 +95,20 @@ readshort(char *packet, char **src, short *dst)
 }
 
 int
-readlong(char *packet, char **src, long *dst)
+readlong(char *packet, char **src, uint32_t *dst)
 {
+	// A long as described in dns protocol is always 32 bits
 	unsigned char *p;
 
 	p = *src;
 
-	*dst = ((long)p[0] << 24) 
-		 | ((long)p[1] << 16) 
-		 | ((long)p[2] << 8)
-		 | ((long)p[3]);
+	*dst = ((uint32_t)p[0] << 24) 
+		 | ((uint32_t)p[1] << 16) 
+		 | ((uint32_t)p[2] << 8)
+		 | ((uint32_t)p[3]);
 
-	(*src) += sizeof(long);
-	return sizeof(long);
+	(*src) += sizeof(uint32_t);
+	return sizeof(uint32_t);
 }
 
 int
@@ -147,8 +148,9 @@ putshort(char **dst, short value)
 }
 
 int
-putlong(char **dst, long value)
+putlong(char **dst, uint32_t value)
 {
+	// A long as described in dns protocol is always 32 bits
 	unsigned char *p;
 
 	p = *dst;
@@ -159,7 +161,7 @@ putlong(char **dst, long value)
 	*p++ = (value);
 
 	(*dst) = p;
-	return sizeof(long);
+	return sizeof(uint32_t);
 }
 
 int
diff --git a/read.h b/read.h
index 27b0cbf..d695a7e 100644
--- a/read.h
+++ b/read.h
@@ -19,12 +19,12 @@
 
 int readname(char *, int, char **, char *, size_t);
 int readshort(char *, char **, short *);
-int readlong(char *, char **, long *);
+int readlong(char *, char **, uint32_t *);
 int readdata(char *, char **, char *, size_t);
 
 int putbyte(char **, char);
 int putshort(char **, short);
-int putlong(char **, long);
+int putlong(char **, uint32_t);
 int putdata(char **, char *, size_t);
 
 #endif
diff --git a/test.c b/test.c
index d9545e2..ee1eb63 100644
--- a/test.c
+++ b/test.c
@@ -23,6 +23,7 @@
 #include <arpa/nameser8_compat.h>
 #endif
 #include <stdio.h>
+#include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 #include <assert.h>
@@ -73,10 +74,10 @@ static void
 test_readputlong()
 {
 	char buf[4];
-	long putint;
-	long tempi;
-	long tint;
-	long *l;
+	uint32_t putint;
+	uint32_t tempi;
+	uint32_t tint;
+	uint32_t *l;
 	char* p;
 	int i;
 
@@ -89,13 +90,13 @@ test_readputlong()
 		p = buf;
 		putlong(&p, tint);
 		l = &putint;
-		memcpy(l, buf, sizeof(int));
+		memcpy(l, buf, sizeof(uint32_t));
 		if (putint != tempi) {
 			printf("Bad value on putlong for %d\n", i);
 			exit(2);
 		}
 		l = &tempi;
-		memcpy(buf, l, sizeof(int));
+		memcpy(buf, l, sizeof(uint32_t));
 		p = buf;
 		readlong(NULL, &p, &tempi);
 		if (tempi != tint) {