diff --git a/lib/unicodesymbols b/lib/unicodesymbols
index 62dd5705ad..4030904e82 100644
--- a/lib/unicodesymbols
+++ b/lib/unicodesymbols
@@ -2234,7 +2234,7 @@
 #
 # miscellaneous technical
 #
-#0x2300 ""                         "" "" "" "" # DIAMETER SIGN
+0x2300 "\\diameter"               "wasysym" "" "\\diameter" "wasysym" # DIAMETER SIGN
 #0x2301 ""                         "" "" "" "" # ELECTRIC ARROW
 0x2302 "{\\ascii\\DEL}"           "ascii" "" # HOUSE
 #0x2303 ""                         "" "" "" "" # UP ARROWHEAD