diff --git a/src/Assembler/Segments/ExpressionAssembler.php b/src/Assembler/Segments/ExpressionAssembler.php
index 94a9251..739d360 100644
--- a/src/Assembler/Segments/ExpressionAssembler.php
+++ b/src/Assembler/Segments/ExpressionAssembler.php
@@ -129,7 +129,7 @@ public function assembleBooleanExpression(BooleanExpression $expr)
 
   public function assembleCounterExpression(CounterExpression $expr)
   {
-    return $this->assembleSegment($expr->getField())
+    return $this->assembleSegment($this->escapeField($expr->getField()))
     . ' ' . $expr->getOperator() . ' '
     . $this->assembleSegment($expr->getValue());
   }