diff --git a/src/dynapyt/instrument/CodeInstrumenter.py b/src/dynapyt/instrument/CodeInstrumenter.py
index f006b2d..0af077b 100644
--- a/src/dynapyt/instrument/CodeInstrumenter.py
+++ b/src/dynapyt/instrument/CodeInstrumenter.py
@@ -186,11 +186,13 @@ def __wrap_in_lambda(self, original_node, updated_node):
 
     def __as_string(self, s):
         if "\\" in s:
-            s = "r" + s
+            raw = "r"
+        else:
+            raw = ""
         if hasattr(self, "quote") and self.quote == '"':
-            return "'" + s + "'"
+            return raw + "'" + s + "'"
         else:
-            return '"' + s + '"'
+            return raw + '"' + s + '"'
 
     def visit_Annotation(self, node):
         return False