diff --git a/Kernel/UnixTypes.h b/Kernel/UnixTypes.h
index 09ed93dda0..d23b48251c 100644
--- a/Kernel/UnixTypes.h
+++ b/Kernel/UnixTypes.h
@@ -215,11 +215,6 @@
 #define TCSADRAIN 1
 #define TCSAFLUSH 2
 
-struct winsize {
-    unsigned short ws_row;
-    unsigned short ws_col;
-};
-
 typedef u32 dev_t;
 typedef u32 ino_t;
 typedef u16 mode_t;
diff --git a/Libraries/LibC/sys/ioctl.h b/Libraries/LibC/sys/ioctl.h
index 95d69f0504..3a2dcd0b5f 100644
--- a/Libraries/LibC/sys/ioctl.h
+++ b/Libraries/LibC/sys/ioctl.h
@@ -5,11 +5,6 @@
 
 __BEGIN_DECLS
 
-struct winsize {
-    unsigned short ws_row;
-    unsigned short ws_col;
-};
-
 int ioctl(int fd, unsigned request, ...);
 
 __END_DECLS
diff --git a/Libraries/LibC/sys/ioctl_numbers.h b/Libraries/LibC/sys/ioctl_numbers.h
index dd6711c43c..26ec4548d5 100644
--- a/Libraries/LibC/sys/ioctl_numbers.h
+++ b/Libraries/LibC/sys/ioctl_numbers.h
@@ -1,5 +1,16 @@
 #pragma once
 
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+struct winsize {
+    unsigned short ws_row;
+    unsigned short ws_col;
+};
+
+__END_DECLS
+
 enum IOCtlNumber {
     TIOCGPGRP,
     TIOCSPGRP,