diff --git a/core/mule.c b/core/mule.c
index d54822c3..b003d88b 100644
--- a/core/mule.c
+++ b/core/mule.c
@@ -198,7 +198,7 @@ void uwsgi_mule_handler() {
 					}
 				}
 				if (!found)
-					uwsgi_log("*** mule %d received a %zd bytes message ***\n", uwsgi.muleid, len);
+					uwsgi_log("*** mule %d received a %ld bytes message ***\n", uwsgi.muleid, (long) len);
 			}
 		}
 	}
diff --git a/core/protocol.c b/core/protocol.c
index 87ed401f..0bcc8a66 100644
--- a/core/protocol.c
+++ b/core/protocol.c
@@ -1376,7 +1376,7 @@ int uwsgi_hooked_parse_dict_dgram(int fd, char *buffer, size_t len, uint8_t modi
 
 
 #ifdef UWSGI_DEBUG
-	uwsgi_log("RLEN: %zd\n", rlen);
+	uwsgi_log("RLEN: %ld\n", (long) rlen);
 #endif
 
 	// check for valid dict 4(header) 2(non-zero key)+1 2(value)
diff --git a/core/spooler.c b/core/spooler.c
index 46c8de6a..d6a36f19 100644
--- a/core/spooler.c
+++ b/core/spooler.c
@@ -245,7 +245,7 @@ int spool_request(struct uwsgi_spooler *uspool, char *filename, int rn, int core
 	close(fd);
 
 	if (!uwsgi.spooler_quiet)
-		uwsgi_log("[spooler] written %zd bytes to file %s\n", size + body_len + 4, filename);
+		uwsgi_log("[spooler] written %lu bytes to file %s\n", (unsigned long) size + body_len + 4, filename);
 
 	// and here waiting threads can continue
 	uwsgi_unlock(uspool->lock);
diff --git a/core/utils.c b/core/utils.c
index 84690e42..32daa211 100644
--- a/core/utils.c
+++ b/core/utils.c
@@ -229,7 +229,7 @@ char *uwsgi_get_cwd() {
 
 	if (getcwd(cwd, newsize) == NULL && errno == ERANGE) {
 		newsize += 256;
-		uwsgi_log("need a bigger buffer (%zd bytes) for getcwd(). doing reallocation.\n", newsize);
+		uwsgi_log("need a bigger buffer (%lu bytes) for getcwd(). doing reallocation.\n", (unsigned long) newsize);
 		free(cwd);
 		cwd = uwsgi_malloc(newsize);
 		if (getcwd(cwd, newsize) == NULL) {
@@ -4182,7 +4182,7 @@ void uwsgi_setup_post_buffering() {
 
 	if (uwsgi.post_buffering_bufsize < uwsgi.post_buffering) {
 		uwsgi.post_buffering_bufsize = uwsgi.post_buffering;
-		uwsgi_log("setting request body buffering size to %zd bytes\n", uwsgi.post_buffering_bufsize);
+		uwsgi_log("setting request body buffering size to %lu bytes\n", (unsigned long) uwsgi.post_buffering_bufsize);
 	}
 
 }
diff --git a/core/uwsgi.c b/core/uwsgi.c
index 095e1b9f..415ad4c1 100644
--- a/core/uwsgi.c
+++ b/core/uwsgi.c
@@ -2348,7 +2348,7 @@ int uwsgi_start(void *v_argv) {
 		(void) pthread_attr_init(&uwsgi.threads_attr);
 		if (uwsgi.threads_stacksize) {
 			if (pthread_attr_setstacksize(&uwsgi.threads_attr, uwsgi.threads_stacksize * 1024) == 0) {
-				uwsgi_log("threads stack size set to %zdk\n", uwsgi.threads_stacksize);
+				uwsgi_log("threads stack size set to %luk\n", (unsigned long) uwsgi.threads_stacksize);
 			}
 			else {
 				uwsgi_log("!!! unable to set requested threads stacksize !!!\n");
diff --git a/plugins/lua/lua_plugin.c b/plugins/lua/lua_plugin.c
index efde5f45..6a2a2a9d 100644
--- a/plugins/lua/lua_plugin.c
+++ b/plugins/lua/lua_plugin.c
@@ -323,7 +323,7 @@ static int uwsgi_lua_input(lua_State *L) {
 	sum = lua_tonumber(L, 2);
 
 	if (n > 1) {
-		uwsgi_log("requested %zd bytes\n", sum);
+		uwsgi_log("requested %ld bytes\n", (long) sum);
 	}
 
 	buf = uwsgi_malloc(sum);
@@ -666,7 +666,7 @@ uint16_t uwsgi_lua_rpc(void * func, uint8_t argc, char **argv, uint16_t argvs[],
 	
 	sv = lua_tolstring(L, -1, &sl);
 
-	uwsgi_log("sv = %s sl = %zd\n", sv, sl);
+	uwsgi_log("sv = %s sl = %lu\n", sv, (unsigned long) sl);
 	if (sl <= 0xffff) {
 		memcpy(buffer, sv, sl);
 		return sl;