diff --git a/lib/sockopt.c b/lib/sockopt.c
index 74bc034ccd75..003ddb72dc2d 100644
--- a/lib/sockopt.c
+++ b/lib/sockopt.c
@@ -19,7 +19,7 @@
 #define HAVE_BSD_STRUCT_IP_MREQ_HACK
 #endif
 
-void setsockopt_so_recvbuf(int sock, int size)
+int setsockopt_so_recvbuf(int sock, int size)
 {
 	int orig_req = size;
 
@@ -34,9 +34,11 @@ void setsockopt_so_recvbuf(int sock, int size)
 		flog_err(EC_LIB_SOCKET,
 			 "%s: fd %d: SO_RCVBUF set to %d (requested %d)",
 			 __func__, sock, size, orig_req);
+
+	return size;
 }
 
-void setsockopt_so_sendbuf(const int sock, int size)
+int setsockopt_so_sendbuf(const int sock, int size)
 {
 	int orig_req = size;
 
@@ -51,6 +53,8 @@ void setsockopt_so_sendbuf(const int sock, int size)
 		flog_err(EC_LIB_SOCKET,
 			 "%s: fd %d: SO_SNDBUF set to %d (requested %d)",
 			 __func__, sock, size, orig_req);
+
+	return size;
 }
 
 int getsockopt_so_sendbuf(const int sock)
diff --git a/lib/sockopt.h b/lib/sockopt.h
index e6fb78d5e4ef..cbf988cbe718 100644
--- a/lib/sockopt.h
+++ b/lib/sockopt.h
@@ -12,8 +12,8 @@
 extern "C" {
 #endif
 
-extern void setsockopt_so_recvbuf(int sock, int size);
-extern void setsockopt_so_sendbuf(const int sock, int size);
+extern int setsockopt_so_recvbuf(int sock, int size);
+extern int setsockopt_so_sendbuf(const int sock, int size);
 extern int getsockopt_so_sendbuf(const int sock);
 extern int getsockopt_so_recvbuf(const int sock);