diff --git a/libxcm/core/log.h b/libxcm/core/log.h
index b21eb57fe..8e918f970 100644
--- a/libxcm/core/log.h
+++ b/libxcm/core/log.h
@@ -40,5 +40,7 @@ bool log_is_enabled(enum log_type type);
 
 void __log_event(enum log_type type, const char *file, int line,
 		 const char *function, struct xcm_socket *s,
-		 const char *format, ...);
+		 const char *format, ...)
+    __attribute__((format (printf, 6, 7)));
+
 #endif
diff --git a/libxcm/core/log_attr_tree.h b/libxcm/core/log_attr_tree.h
index b6d184c59..8b6198ec5 100644
--- a/libxcm/core/log_attr_tree.h
+++ b/libxcm/core/log_attr_tree.h
@@ -32,7 +32,7 @@
 		   log_attr_type_name(actual_type))
 
 #define LOG_ATTR_TREE_NODE_IS_NOT_VALUE(s, path_str)			\
-    log_debug_sock(s, "Attribute at \"%s\" is a dictionary or list.")
+    log_debug_sock(s, "Attribute at \"%s\" is a dictionary or list.", path_str)
 
 #define LOG_ATTR_TREE_NON_EXISTENT(s, name)			\
     log_debug_sock(s, "Attribute \"%s\" does not exist.", name)
@@ -66,7 +66,7 @@
     } while (0)
 
 #define LOG_ATTR_TREE_NODE_IS_NOT_LIST(s, path_str)			\
-    log_debug_sock(s, "Attribute at \"%s\" is not a list.")
+    log_debug_sock(s, "Attribute at \"%s\" is not a list.", path_str)
 
 #define LOG_ATTR_TREE_LIST_LEN_RESULT(s, attr_name, len)		\
     log_debug_sock(s, "Length of \"%s\" is %d.", attr_name, len)
diff --git a/libxcm/tp/common/log_tp.h b/libxcm/tp/common/log_tp.h
index 030bdd0e1..693d29531 100644
--- a/libxcm/tp/common/log_tp.h
+++ b/libxcm/tp/common/log_tp.h
@@ -196,7 +196,7 @@
 		   "layer.")
 
 #define LOG_SEND_BUF_LINGER(conn_sock, left)				\
-    log_debug_sock(conn_sock, "%zd bytes not yet delivered to lower "	\
+    log_debug_sock(conn_sock, "%d bytes not yet delivered to lower "	\
 		   "layer.", left)
 
 #define LOG_FILL_BUFFER_ATTEMPT(conn_sock, len)				\
@@ -226,7 +226,7 @@
 		   len)
 
 #define LOG_RCV_MSG(conn_sock, len)					\
-    log_debug_sock(conn_sock, "Received a complete %d byte message from " \
+    log_debug_sock(conn_sock, "Received a complete %zd byte message from " \
 		   "lower layer.", len)
 
 #define LOG_RCV_MSG_TRUNCATED(conn_sock, capacity, len) \
diff --git a/libxcm/tp/tcp/xcm_tp_btcp.c b/libxcm/tp/tcp/xcm_tp_btcp.c
index 65c407829..2a85cef39 100644
--- a/libxcm/tp/tcp/xcm_tp_btcp.c
+++ b/libxcm/tp/tcp/xcm_tp_btcp.c
@@ -640,7 +640,7 @@ static int btcp_send(struct xcm_socket *__restrict s,
 	int rc = send(bts->fd, buf, len, MSG_NOSIGNAL);
 
 	if (rc > 0) {
-	    LOG_SEND_ACCEPTED(s, buf, rc);
+	    LOG_SEND_ACCEPTED(s, buf, (size_t)rc);
 	    XCM_TP_CNT_BYTES_INC(bts->conn.cnts, from_app, rc);
 
 	    LOG_LOWER_DELIVERED_PART(s, rc);
@@ -979,7 +979,7 @@ static int set_dns_algorithm_attr(struct xcm_socket *s, void *context,
     enum tconnect_algorithm algorithm = tconnect_algorithm_enum(value);
 
     if (algorithm == tconnect_algorithm_none) {
-	LOG_INVALID_DNS_ALGORITHM(s, value);
+	LOG_INVALID_DNS_ALGORITHM(s, (const char *)value);
 	errno = EINVAL;
 	return -1;
     }
diff --git a/libxcm/tp/tls/log_tls.h b/libxcm/tp/tls/log_tls.h
index 5c84234d2..c568db283 100644
--- a/libxcm/tp/tls/log_tls.h
+++ b/libxcm/tp/tls/log_tls.h
@@ -113,7 +113,7 @@
 	    ut_aprintf(buf, sizeof(buf), "; CRL \"%s\"",		\
 		       item_unsensitive_data(crl));			\
 	ut_aprintf(buf, sizeof(buf), ".");				\
-	log_debug_sock(s, buf);						\
+	log_debug_sock(s, "%s", buf);					\
     } while (0)
 
 #define LOG_TLS_CREATING_CTX(s, cert, key, tc, crl)			\
@@ -142,7 +142,7 @@ void hash_description(uint8_t *hash, size_t hash_len, char *buf);
 	    ut_aprintf(buf, sizeof(buf), "; CRL \"%s\"",		\
 		       item_unsensitive_data(crl));			\
 	ut_aprintf(buf, sizeof(buf), " %s %s.", event, hash_desc);	\
-	log_debug_sock(s, buf);						\
+	log_debug_sock(s, "%s", buf);					\
     } while (0)
     
 #define LOG_TLS_CTX_HASH(s, cert, key, tc, crl, hash, hash_size)	\
diff --git a/libxcm/tp/tls/xcm_tp_btls.c b/libxcm/tp/tls/xcm_tp_btls.c
index 763dc3891..497e2eb94 100644
--- a/libxcm/tp/tls/xcm_tp_btls.c
+++ b/libxcm/tp/tls/xcm_tp_btls.c
@@ -1034,7 +1034,7 @@ static int btls_send(struct xcm_socket *__restrict s,
     UT_RESTORE_ERRNO(write_errno);
 
     if (rc > 0) {
-	LOG_SEND_ACCEPTED(s, buf, rc);
+	LOG_SEND_ACCEPTED(s, buf, (size_t)rc);
 	XCM_TP_CNT_BYTES_INC(bts->conn.cnts, from_app, rc);
 
 	LOG_LOWER_DELIVERED_PART(s, rc);
diff --git a/libxcm/tp/ux/xcm_tp_ux.c b/libxcm/tp/ux/xcm_tp_ux.c
index 4fd86b941..0fa60733c 100644
--- a/libxcm/tp/ux/xcm_tp_ux.c
+++ b/libxcm/tp/ux/xcm_tp_ux.c
@@ -392,7 +392,7 @@ static int ux_receive(struct xcm_socket *__restrict s,
     int rc = recv(us->fd, buf, capacity, MSG_TRUNC);
 
     if (rc > 0) {
-	LOG_RCV_MSG(s, rc);
+	LOG_RCV_MSG(s, (size_t)rc);
 	XCM_TP_CNT_MSG_INC(us->cnts, from_lower, rc);
 	LOG_APP_DELIVERED(s, rc);
 	XCM_TP_CNT_MSG_INC(us->cnts, to_app, rc);