diff --git a/dlls/ntdll/file.c b/dlls/ntdll/file.c
index d7f5b938ef..57460234a9 100644
--- a/dlls/ntdll/file.c
+++ b/dlls/ntdll/file.c
@@ -45,6 +45,9 @@
 #ifdef HAVE_SYS_IOCTL_H
 #include <sys/ioctl.h>
 #endif
+#ifdef HAVE_SYS_FILIO_H
+# include <sys/filio.h>
+#endif
 #ifdef HAVE_POLL_H
 #include <poll.h>
 #endif
diff --git a/dlls/winhttp/net.c b/dlls/winhttp/net.c
index a788b018a0..54ceb1c13c 100644
--- a/dlls/winhttp/net.c
+++ b/dlls/winhttp/net.c
@@ -31,6 +31,9 @@
 #ifdef HAVE_SYS_IOCTL_H
 # include <sys/ioctl.h>
 #endif
+#ifdef HAVE_SYS_FILIO_H
+# include <sys/filio.h>
+#endif
 #ifdef HAVE_POLL_H
 # include <poll.h>
 #endif
diff --git a/dlls/wininet/netconnection.c b/dlls/wininet/netconnection.c
index 7f6fed7c3b..77f39bbf62 100644
--- a/dlls/wininet/netconnection.c
+++ b/dlls/wininet/netconnection.c
@@ -37,6 +37,9 @@
 #ifdef HAVE_SYS_SOCKET_H
 # include <sys/socket.h>
 #endif
+#ifdef HAVE_SYS_FILIO_H
+# include <sys/filio.h>
+#endif
 #ifdef HAVE_UNISTD_H
 # include <unistd.h>
 #endif