diff --git a/loopy/kernel/data.py b/loopy/kernel/data.py
index e1b9575df8f2fdeae986f25975c2ea3c05a589ba..a7e4720147b4f6e8d7ab4afbd6b83db2dc339bb2 100644
--- a/loopy/kernel/data.py
+++ b/loopy/kernel/data.py
@@ -723,7 +723,7 @@ class ExpressionInstruction(InstructionBase):
 
 
 def _remove_common_indentation(code):
-    if not "\n" in code:
+    if "\n" not in code:
         return code
 
     # accommodate pyopencl-ish syntax highlighting