diff --git a/slither/tools/mutator/mutators/LIR.py b/slither/tools/mutator/mutators/LIR.py
index cc58cbae1..6116669c6 100644
--- a/slither/tools/mutator/mutators/LIR.py
+++ b/slither/tools/mutator/mutators/LIR.py
@@ -31,7 +31,7 @@ def _mutate(self) -> Dict:  # pylint: disable=too-many-branches
                         literal_replacements.append(variable.type.max)  # append data type max value
                         if str(variable.type).startswith("uint"):
                             literal_replacements.append("1")
-                        elif str(variable.type).startswith("uint"):
+                        elif str(variable.type).startswith("int"):
                             literal_replacements.append("-1")
                     # Get the string
                     start = variable.source_mapping.start