diff --git a/lib/symbols b/lib/symbols
index 1361c9b8b7..cbd83070b5 100644
--- a/lib/symbols
+++ b/lib/symbols
@@ -674,7 +674,7 @@ currency           wasy          27  0 textmode ¤ wasysym # works in text
 phone              wasy          7   0 textmode ☎  wasysym # works in text mode only (produces \Upsilon in math mode)
 recorder           wasy          6   0 textmode ⌕ wasysym # works in text mode only (produces \Sigma in math mode)
 clock              wasy          28  0 textmode &clock;  wasysym # works in text mode only (produces \o in math mode)
-lightning          wasy          18  0 x        ☇
+lightning          wasy          18  0 textmode ☇ wasysym # works in text mode only (produces ` in math mode)
 # FIXME Display is wrong (bug 8493): qt does not display characters at the \t position (0x09)
 pointer            wasy          9   0 textmode x        wasysym # works in text mode only (produces \Psi in math mode)
 RIGHTarrow         wasy          17  0 textmode ▶ wasysym # works in text mode only (produces \jmath in math mode)