diff --git a/ares_create_query.c b/ares_create_query.c
index 07d75701..5a0e2e6f 100644
--- a/ares_create_query.c
+++ b/ares_create_query.c
@@ -188,7 +188,7 @@ int ares_create_query(const char *name, int dnsclass, int type,
    * specified in RFC 1035 ("To simplify implementations, the total length of
    * a domain name (i.e., label octets and label length octets) is restricted
    * to 255 octets or less."). */
-  if (buflen > (MAXCDNAME + HFIXEDSZ + QFIXEDSZ +
+  if (buflen > (size_t)(MAXCDNAME + HFIXEDSZ + QFIXEDSZ +
                 (max_udp_size ? EDNSFIXEDSZ : 0))) {
     ares_free (buf);
     return ARES_EBADNAME;
diff --git a/ares_init.c b/ares_init.c
index b322fc47..2ef1d1b4 100644
--- a/ares_init.c
+++ b/ares_init.c
@@ -1257,7 +1257,7 @@ static int get_DNS_AdaptersAddresses(char **outptr)
         }
         else
         {
-          addresses[addressesIndex].metric = -1;
+          addresses[addressesIndex].metric = (ULONG)-1;
         }
 
         /* Record insertion index to make qsort stable */
@@ -1304,7 +1304,7 @@ static int get_DNS_AdaptersAddresses(char **outptr)
         }
         else
         {
-          addresses[addressesIndex].metric = -1;
+          addresses[addressesIndex].metric = (ULONG)-1;
         }
 
         /* Record insertion index to make qsort stable */
@@ -1405,24 +1405,24 @@ static void replace_comma_by_space(char* str)
  * 'suffix' is one domain suffix, 'len' is the length of 'suffix'.
  * The search ignores case. E.g.:
  * contains_suffix("abc.def,ghi.jkl", "ghi.JKL") returns true  */
-static bool contains_suffix(const char* const searchlist,
+static BOOL contains_suffix(const char* const searchlist,
                             const char* const suffix, const size_t len)
 {
   const char* beg = searchlist;
   const char* end;
   if (!*suffix)
-    return true;
+    return TRUE;
   for (;;)
   {
     while (*beg && (ISSPACE(*beg) || (*beg == ',')))
       ++beg;
     if (!*beg)
-      return false;
+      return FALSE;
     end = beg;
     while (*end && !ISSPACE(*end) && (*end != ','))
       ++end;
-    if (len == (end - beg) && !strnicmp(beg, suffix, len))
-      return true;
+    if (len == (size_t)(end - beg) && !strnicmp(beg, suffix, len))
+      return TRUE;
     beg = end;
   }
 }
diff --git a/ares_library_init.c b/ares_library_init.c
index 88e7a537..67563499 100644
--- a/ares_library_init.c
+++ b/ares_library_init.c
@@ -40,9 +40,19 @@ static unsigned int ares_initialized;
 static int          ares_init_flags;
 
 /* library-private global vars with visibility across the whole library */
-void *(*ares_malloc)(size_t size) = malloc;
-void *(*ares_realloc)(void *ptr, size_t size) = realloc;
-void (*ares_free)(void *ptr) = free;
+#if defined(WIN32)
+/* We need indirections to handle Windows DLL rules. */
+static void *default_malloc(size_t size) { return malloc(size); }
+static void *default_realloc(void *p, size_t size) { return realloc(p, size); }
+static void default_free(void *p) { free(p); }
+#else
+# define default_malloc malloc
+# define default_realloc realloc
+# define default_free free
+#endif
+void *(*ares_malloc)(size_t size) = default_malloc;
+void *(*ares_realloc)(void *ptr, size_t size) = default_realloc;
+void (*ares_free)(void *ptr) = default_free;
 
 #ifdef USE_WINSOCK
 static HMODULE hnd_iphlpapi;