diff --git a/src/win32/win_sys.c b/src/win32/win_sys.c
index eec04380..80b89a6e 100644
--- a/src/win32/win_sys.c
+++ b/src/win32/win_sys.c
@@ -3605,7 +3605,7 @@ INT32 I_ClipboardCopy(const char *data, size_t size)
 	return -1;
 }
 
-char *I_ClipboardPaste(void)
+const char *I_ClipboardPaste(void)
 {
 	return NULL;
 }