diff --git a/Libraries/LibC/unistd.cpp b/Libraries/LibC/unistd.cpp
index 79d10e6042..066cf4c223 100644
--- a/Libraries/LibC/unistd.cpp
+++ b/Libraries/LibC/unistd.cpp
@@ -412,6 +412,8 @@ long fpathconf(int fd, int name)
     switch (name) {
     case _PC_PATH_MAX:
         return PATH_MAX;
+    case _PC_VDISABLE:
+        return _POSIX_VDISABLE;
     }
 
     ASSERT_NOT_REACHED();
diff --git a/Libraries/LibC/unistd.h b/Libraries/LibC/unistd.h
index c7999b335c..d9f8d590b3 100644
--- a/Libraries/LibC/unistd.h
+++ b/Libraries/LibC/unistd.h
@@ -117,7 +117,8 @@ int umount(const char* mountpoint);
 enum {
     _PC_NAME_MAX,
     _PC_PATH_MAX,
-    _PC_PIPE_BUF
+    _PC_PIPE_BUF,
+    _PC_VDISABLE
 };
 
 #define HOST_NAME_MAX 64
@@ -132,5 +133,6 @@ enum {
  * range of values), but we do have process priorities.
  */
 #define _POSIX_PRIORITY_SCHEDULING
+#define _POSIX_VDISABLE '\0'
 
 __END_DECLS