diff --git a/lib/hostares.c b/lib/hostares.c
index 708af4e86b..b6af96f83f 100644
--- a/lib/hostares.c
+++ b/lib/hostares.c
@@ -24,6 +24,7 @@
 #include "setup.h"
 
 #include <string.h>
+#include <limits.h>
 
 #ifdef NEED_MALLOC_H
 #include <malloc.h>
diff --git a/lib/qssl.c b/lib/qssl.c
index bf4e5f7981..f2de800c54 100644
--- a/lib/qssl.c
+++ b/lib/qssl.c
@@ -27,6 +27,7 @@
 #include <qsossl.h>
 #include <errno.h>
 #include <string.h>
+#include <limits.h>
 
 #include <curl/curl.h>
 #include "urldata.h"
diff --git a/lib/ssluse.c b/lib/ssluse.c
index 5d82691de2..3887f95028 100644
--- a/lib/ssluse.c
+++ b/lib/ssluse.c
@@ -36,6 +36,7 @@
 #include <string.h>
 #include <stdlib.h>
 #include <ctype.h>
+#include <limits.h>
 #ifdef HAVE_SYS_SOCKET_H
 #include <sys/socket.h>
 #endif