diff --git a/ggsn/ggsn.c b/ggsn/ggsn.c
index 62a37f2..60a4f80 100644
--- a/ggsn/ggsn.c
+++ b/ggsn/ggsn.c
@@ -124,7 +124,7 @@
 
 int encaps_printf(void *p, void *packet, unsigned len)
 {
-  int i;
+  unsigned int i;
   if (debug) {
     printf("The packet looks like this:\n");
     for( i=0; i<len; i++) {
@@ -423,7 +423,7 @@
   }
   apn.l = strlen(args_info.apn_arg) + 1;
   apn.v[0] = (char) strlen(args_info.apn_arg);
-  strncpy(&apn.v[1], args_info.apn_arg, sizeof(apn.v)-1);
+  strncpy((char *) &apn.v[1], args_info.apn_arg, sizeof(apn.v)-1);
 
 
   /* foreground                                                   */
diff --git a/ggsn/ippool.c b/ggsn/ippool.c
index 35b14a3..fa3d8af 100644
--- a/ggsn/ippool.c
+++ b/ggsn/ippool.c
@@ -23,7 +23,7 @@
 
 
 int ippool_printaddr(struct ippool_t *this) {
-  int n;
+  unsigned int n;
   printf("ippool_printaddr\n");
   printf("Firstdyn %d\n", this->firstdyn - this->member);
   printf("Lastdyn %d\n",  this->lastdyn - this->member);
@@ -110,7 +110,7 @@
   unsigned int a1, a2, a3, a4;
   unsigned int m1, m2, m3, m4;
   int c;
-  unsigned int m;
+  int m;
   int masklog;
 
   c = sscanf(pool, "%u.%u.%u.%u/%u.%u.%u.%u",
@@ -167,8 +167,8 @@
   struct in_addr stataddr;
   struct in_addr statmask;
   unsigned int m;
-  unsigned int listsize;
-  unsigned int dynsize;
+  int listsize;
+  int dynsize;
   unsigned int statsize;
 
   if (!allowdyn) {
diff --git a/ggsn/ippool.h b/ggsn/ippool.h
index fe9f90c..02691a6 100644
--- a/ggsn/ippool.h
+++ b/ggsn/ippool.h
@@ -37,13 +37,13 @@
 struct ippoolm_t;                /* Forward declaration */
 
 struct ippool_t {
-  int listsize;                  /* Total number of addresses */
+  unsigned int listsize;                  /* Total number of addresses */
   int allowdyn;                  /* Allow dynamic IP address allocation */
   int allowstat;                 /* Allow static IP address allocation */
   struct in_addr stataddr;       /* Static address range network address */
   struct in_addr statmask;       /* Static address range network mask */
   struct ippoolm_t *member;      /* Listsize array of members */
-  int hashsize;                  /* Size of hash table */
+  unsigned int hashsize;                  /* Size of hash table */
   int hashlog;                   /* Log2 size of hash table */
   int hashmask;                  /* Bitmask for calculating hash */
   struct ippoolm_t **hash;       /* Hashsize array of pointer to member */
diff --git a/ggsn/syserr.c b/ggsn/syserr.c
index e0ebc3a..002d8c3 100644
--- a/ggsn/syserr.c
+++ b/ggsn/syserr.c
@@ -41,7 +41,7 @@
   va_list args;
   char buf[SYSERR_MSGSIZE];
   char buf2[SYSERR_MSGSIZE];
-  int n;
+  unsigned int n;
   int pos;
   
   va_start(args, fmt);
diff --git a/ggsn/tun.c b/ggsn/tun.c
index 365aec0..1cc706b 100644
--- a/ggsn/tun.c
+++ b/ggsn/tun.c
@@ -243,7 +243,7 @@
   } req;
   
   struct sockaddr_nl local;
-  int addr_len;
+  socklen_t addr_len;
   int fd;
   int status;