diff --git a/lib/isc/unix/socket.c b/lib/isc/unix/socket.c
index 628b6b240a..f2eef845dc 100644
--- a/lib/isc/unix/socket.c
+++ b/lib/isc/unix/socket.c
@@ -5406,6 +5406,7 @@ isc__socket_cleanunix(isc_sockaddr_t *sockaddr, bool active) {
 #endif
 
 #if !defined(S_ISFIFO) && !defined(S_ISSOCK)
+/* cppcheck-suppress preprocessorErrorDirective */
 #error You need to define S_ISFIFO and S_ISSOCK as appropriate for your platform.  See <sys/stat.h>.
 #endif