diff --git a/src/PhpDocument.php b/src/PhpDocument.php
index 00face9..f99b17d 100644
--- a/src/PhpDocument.php
+++ b/src/PhpDocument.php
@@ -350,6 +350,11 @@ class PhpDocument
                 }
                 return (string)$class->namespacedName . '::' . $node->name;
             }
+        } else if ($node instanceof Node\Expr\FuncCall && $node->name instanceof Node\Name && (string)$node->name === 'define') {
+            if (!isset($node->args[0]) || !($node->args[0]->value instanceof Node\Scalar\String_)) {
+                return null;
+            }
+            return (string)$node->args[0]->value->value;
         }
     }
 
diff --git a/src/Protocol/SymbolInformation.php b/src/Protocol/SymbolInformation.php
index ee88176..a8962c5 100644
--- a/src/Protocol/SymbolInformation.php
+++ b/src/Protocol/SymbolInformation.php
@@ -58,13 +58,25 @@ class SymbolInformation
             Node\Stmt\PropertyProperty::class => SymbolKind::FIELD,
             Node\Const_::class                => SymbolKind::CONSTANT
         ];
-        $class = get_class($node);
-        if (!isset($nodeSymbolKindMap[$class])) {
-            throw new Exception("Not a declaration node: $class");
-        }
         $symbol = new self;
-        $symbol->kind = $nodeSymbolKindMap[$class];
-        $symbol->name = (string)$node->name;
+        if (
+            $node instanceof Node\Expr\FuncCall
+            && $node->name instanceof Node\Name
+            && (string)$node->name === 'define'
+            && isset($node->args[0])
+            && $node->args[0]->value instanceof Node\Scalar\String_
+        ) {
+            // define() constant
+            $symbol->kind = SymbolKind::CONSTANT;
+            $symbol->name = (string)$node->args[0]->value->value;
+        } else {
+            $class = get_class($node);
+            if (!isset($nodeSymbolKindMap[$class])) {
+                throw new Exception("Not a declaration node: $class");
+            }
+            $symbol->kind = $nodeSymbolKindMap[$class];
+            $symbol->name = (string)$node->name;
+        }
         $symbol->location = Location::fromNode($node);
         if ($fqn !== null) {
             $parts = preg_split('/(::|\\\\)/', $fqn);