diff --git a/grammar.js b/grammar.js
index a6a48a9..185b543 100644
--- a/grammar.js
+++ b/grammar.js
@@ -193,7 +193,7 @@ module.exports = grammar({
       PREC.assign,
       seq(
         field("left", $._lvalue),
-        ":=",
+        alias(":=", $.operator),
         field("right", $._expr),
       ),
     ),
@@ -223,7 +223,7 @@ module.exports = grammar({
     for_expression: ($) => seq(
       "for",
       field("index", $.identifier),
-      ":=",
+      alias(":=", $.operator),
       field("start", $._expr),
       "to",
       field("end", $._expr),
@@ -325,7 +325,7 @@ module.exports = grammar({
       "var",
       field("name", $.identifier),
       optional(seq(":", field("type", $._type_identifier))),
-      ":=",
+      alias(":=", $.operator),
       field("value", $._expr),
     ),
 
diff --git a/src/grammar.json b/src/grammar.json
index edb5155..f5b0dfc 100644
--- a/src/grammar.json
+++ b/src/grammar.json
@@ -822,8 +822,13 @@
             }
           },
           {
-            "type": "STRING",
-            "value": ":="
+            "type": "ALIAS",
+            "content": {
+              "type": "STRING",
+              "value": ":="
+            },
+            "named": true,
+            "value": "operator"
           },
           {
             "type": "FIELD",
@@ -939,8 +944,13 @@
           }
         },
         {
-          "type": "STRING",
-          "value": ":="
+          "type": "ALIAS",
+          "content": {
+            "type": "STRING",
+            "value": ":="
+          },
+          "named": true,
+          "value": "operator"
         },
         {
           "type": "FIELD",
@@ -1469,8 +1479,13 @@
           ]
         },
         {
-          "type": "STRING",
-          "value": ":="
+          "type": "ALIAS",
+          "content": {
+            "type": "STRING",
+            "value": ":="
+          },
+          "named": true,
+          "value": "operator"
         },
         {
           "type": "FIELD",
diff --git a/src/node-types.json b/src/node-types.json
index d8e1a14..e9aba88 100644
--- a/src/node-types.json
+++ b/src/node-types.json
@@ -389,6 +389,16 @@
           }
         ]
       }
+    },
+    "children": {
+      "multiple": false,
+      "required": true,
+      "types": [
+        {
+          "type": "operator",
+          "named": true
+        }
+      ]
     }
   },
   {
@@ -811,6 +821,16 @@
           }
         ]
       }
+    },
+    "children": {
+      "multiple": false,
+      "required": true,
+      "types": [
+        {
+          "type": "operator",
+          "named": true
+        }
+      ]
     }
   },
   {
@@ -2067,6 +2087,16 @@
           }
         ]
       }
+    },
+    "children": {
+      "multiple": false,
+      "required": true,
+      "types": [
+        {
+          "type": "operator",
+          "named": true
+        }
+      ]
     }
   },
   {
@@ -2255,10 +2285,6 @@
     "type": ":",
     "named": false
   },
-  {
-    "type": ":=",
-    "named": false
-  },
   {
     "type": ";",
     "named": false
diff --git a/src/parser.c b/src/parser.c
index a93aeb0..06ee35e 100644
--- a/src/parser.c
+++ b/src/parser.c
@@ -136,7 +136,7 @@ static const char * const ts_symbol_names[] = {
   [anon_sym_of] = "of",
   [anon_sym_LBRACE] = "{",
   [anon_sym_RBRACE] = "}",
-  [anon_sym_COLON_EQ] = ":=",
+  [anon_sym_COLON_EQ] = "operator",
   [anon_sym_if] = "if",
   [anon_sym_then] = "then",
   [anon_sym_else] = "else",
@@ -227,7 +227,7 @@ static const TSSymbol ts_symbol_map[] = {
   [anon_sym_of] = anon_sym_of,
   [anon_sym_LBRACE] = anon_sym_LBRACE,
   [anon_sym_RBRACE] = anon_sym_RBRACE,
-  [anon_sym_COLON_EQ] = anon_sym_COLON_EQ,
+  [anon_sym_COLON_EQ] = anon_sym_DASH,
   [anon_sym_if] = anon_sym_if,
   [anon_sym_then] = anon_sym_then,
   [anon_sym_else] = anon_sym_else,
@@ -407,7 +407,7 @@ static const TSSymbolMetadata ts_symbol_metadata[] = {
   },
   [anon_sym_COLON_EQ] = {
     .visible = true,
-    .named = false,
+    .named = true,
   },
   [anon_sym_if] = {
     .visible = true,
diff --git a/test/corpus/comments.txt b/test/corpus/comments.txt
index 62f2cc7..70e0b88 100644
--- a/test/corpus/comments.txt
+++ b/test/corpus/comments.txt
@@ -112,10 +112,12 @@ end
     (comment)
     (variable_declaration
       (identifier)
+      (operator)
       (integer_literal))
     (comment)
     (variable_declaration
       (identifier)
+      (operator)
       (integer_literal))
     (comment)
     (comment)
diff --git a/test/corpus/control_flow.txt b/test/corpus/control_flow.txt
index 1c22b63..f3426df 100644
--- a/test/corpus/control_flow.txt
+++ b/test/corpus/control_flow.txt
@@ -65,6 +65,7 @@ for i := 12 to nil do "42"
 (source_file
   (for_expression
     index: (identifier)
+    (operator)
     start: (integer_literal)
     end: (nil_literal)
     body: (string_literal)))
@@ -134,6 +135,7 @@ for i := break to break do while break do break
 (source_file
   (for_expression
     (identifier)
+    (operator)
     (break_expression)
     (break_expression)
     (while_expression
diff --git a/test/corpus/declarations.txt b/test/corpus/declarations.txt
index 98bdd2b..6383f93 100644
--- a/test/corpus/declarations.txt
+++ b/test/corpus/declarations.txt
@@ -217,6 +217,7 @@ var a := 12
 (source_file
   (variable_declaration
     name: (identifier)
+    (operator)
     value: (integer_literal)))
 
 ================================================================================
@@ -231,6 +232,7 @@ var a : int := 27
   (variable_declaration
     name: (identifier)
     type: (type_identifier)
+    (operator)
     value: (integer_literal)))
 
 ================================================================================
@@ -245,9 +247,11 @@ var b := 27
 (source_file
   (variable_declaration
     name: (identifier)
+    (operator)
     value: (integer_literal))
   (variable_declaration
     name: (identifier)
+    (operator)
     value: (integer_literal)))
 
 ================================================================================
diff --git a/test/corpus/expressions.txt b/test/corpus/expressions.txt
index 8d2520a..8555035 100644
--- a/test/corpus/expressions.txt
+++ b/test/corpus/expressions.txt
@@ -150,10 +150,12 @@ a := array[12] := record.field
 (source_file
   (assignment_expression
     left: (identifier)
+    (operator)
     right: (assignment_expression
       left: (array_value
         array: (identifier)
         index: (integer_literal))
+      (operator)
       right: (record_value
         record: (identifier)
         field: (field_identifier)))))