diff --git a/editors/code/rust.tmGrammar.json b/editors/code/rust.tmGrammar.json
index 77595aa006..7475aadbb9 100644
--- a/editors/code/rust.tmGrammar.json
+++ b/editors/code/rust.tmGrammar.json
@@ -693,7 +693,7 @@
                 {
                     "comment": "assignment operators",
                     "name": "keyword.operator.assignment.rust",
-                    "match": "(-=|\\*=|/=|%=|\\^=|&=|\\|=|<<=|>>=)"
+                    "match": "(\\+=|-=|\\*=|/=|%=|\\^=|&=|\\|=|<<=|>>=)"
                 },
                 {
                     "comment": "single equal",