3 files changed, 3 insertions, 3 deletions
diff --git a/src/tools/echo/echo.c b/src/tools/echo/echo.c
index 28ae4c1a..82d280f9 100644
--- a/src/tools/echo/echo.c
+++ b/src/tools/echo/echo.c
@@ -30,7 +30,7 @@
 #include "echo_client.c"
 #include "echo_server.c"
 
-static void usage()
+static void usage(void)
 {
         printf("Usage: echo-app [OPTION]...\n"
                "Sends an echo between a server and a client\n\n"
diff --git a/src/tools/echo/echo_client.c b/src/tools/echo/echo_client.c
index f006273c..3507364a 100644
--- a/src/tools/echo/echo_client.c
+++ b/src/tools/echo/echo_client.c
@@ -23,7 +23,7 @@
 #include <ouroboros/dev.h>
 #include <stdlib.h>
 
-int client_main()
+int client_main(void)
 {
         int fd = 0;
         int result = 0;
diff --git a/src/tools/echo/echo_server.c b/src/tools/echo/echo_server.c
index acf691b3..070f0ce3 100644
--- a/src/tools/echo/echo_server.c
+++ b/src/tools/echo/echo_server.c
@@ -35,7 +35,7 @@ void shutdown_server(int signo)
         exit(EXIT_SUCCESS);
 }
 
-int server_main()
+int server_main(void)
 {
         int    client_fd = 0;
         char   buf[BUF_SIZE];