diff --git a/src/DefinitionResolver.php b/src/DefinitionResolver.php
index bbf9076..64c16d4 100644
--- a/src/DefinitionResolver.php
+++ b/src/DefinitionResolver.php
@@ -725,6 +725,19 @@ class DefinitionResolver
      */
     public function getTypeFromNode(Node $node)
     {
+        if (
+            $node instanceof Node\Expr\FuncCall
+            && $node->name instanceof Node\Name
+            && strtolower((string)$node->name) === 'define'
+            && isset($node->args[0])
+            && $node->args[0]->value instanceof Node\Scalar\String_
+            && isset($node->args[1])
+        ) {
+            // constants with define() like
+            // define('TEST_DEFINE_CONSTANT', false);
+            return $this->resolveExpressionNodeToType($node->args[1]->value);
+        }
+
         if ($node instanceof Node\Param) {
             // Parameters
             $docBlock = $node->getAttribute('parentNode')->getAttribute('docBlock');
@@ -883,7 +896,7 @@ class DefinitionResolver
                 return (string)$class->namespacedName . '::' . $node->name;
             }
         } else if ($node instanceof Node\Expr\FuncCall && $node->name instanceof Node\Name && strtolower((string)$node->name) === 'define') {
-            if (!isset($node->args[0]) || !($node->args[0]->value instanceof Node\Scalar\String_)) {
+            if (!isset($node->args[0]) || !($node->args[0]->value instanceof Node\Scalar\String_) || !isset($node->args[1])) {
                 return null;
             }
             return (string)$node->args[0]->value->value;
diff --git a/src/Protocol/SymbolInformation.php b/src/Protocol/SymbolInformation.php
index 4fb1d3f..da04404 100644
--- a/src/Protocol/SymbolInformation.php
+++ b/src/Protocol/SymbolInformation.php
@@ -57,6 +57,7 @@ class SymbolInformation
             && strtolower((string)$node->name) === 'define'
             && isset($node->args[0])
             && $node->args[0]->value instanceof Node\Scalar\String_
+            && isset($node->args[1])
         ) {
             // constants with define() like
             // define('TEST_DEFINE_CONSTANT', false);
@@ -90,7 +91,7 @@ class SymbolInformation
         } else {
             return null;
         }
-        
+
         if (!isset($symbol->name)) {
             if ($node instanceof Node\Name) {
                 $symbol->name = (string)$node;