diff --git a/crates/ruff_python_parser/resources/inline/err/walrus_before_py38.py b/crates/ruff_python_parser/resources/inline/err/walrus_before_py38.py
index d96b7d9869c85..bf757cb6f358b 100644
--- a/crates/ruff_python_parser/resources/inline/err/walrus_before_py38.py
+++ b/crates/ruff_python_parser/resources/inline/err/walrus_before_py38.py
@@ -1,2 +1,2 @@
-# parse_options: { "target_version": "3.7" }
+# parse_options: { "target-version": "3.7" }
 if x := 1: ...
diff --git a/crates/ruff_python_parser/resources/inline/ok/walrus_after_py38.py b/crates/ruff_python_parser/resources/inline/ok/walrus_after_py38.py
index d8fc5eb08e175..a1ff11b6fe9d2 100644
--- a/crates/ruff_python_parser/resources/inline/ok/walrus_after_py38.py
+++ b/crates/ruff_python_parser/resources/inline/ok/walrus_after_py38.py
@@ -1,2 +1,2 @@
-# parse_options: { "target_version": "3.8" }
+# parse_options: { "target-version": "3.8" }
 if x := 1: ...
diff --git a/crates/ruff_python_parser/src/parser/expression.rs b/crates/ruff_python_parser/src/parser/expression.rs
index d94d7e9ff6da4..29622cab08982 100644
--- a/crates/ruff_python_parser/src/parser/expression.rs
+++ b/crates/ruff_python_parser/src/parser/expression.rs
@@ -2164,11 +2164,11 @@ impl<'src> Parser<'src> {
         let range = self.node_range(start);
 
         // test_err walrus_before_py38
-        // # parse_options: { "target_version": "3.7" }
+        // # parse_options: { "target-version": "3.7" }
         // if x := 1: ...
 
         // test_ok walrus_after_py38
-        // # parse_options: { "target_version": "3.8" }
+        // # parse_options: { "target-version": "3.8" }
         // if x := 1: ...
 
         if self.options.target_version < PythonVersion::PY38 {
diff --git a/crates/ruff_python_parser/tests/snapshots/invalid_syntax@walrus_before_py38.py.snap b/crates/ruff_python_parser/tests/snapshots/invalid_syntax@walrus_before_py38.py.snap
index a37daa9ef09fc..3b0b772e4d110 100644
--- a/crates/ruff_python_parser/tests/snapshots/invalid_syntax@walrus_before_py38.py.snap
+++ b/crates/ruff_python_parser/tests/snapshots/invalid_syntax@walrus_before_py38.py.snap
@@ -54,7 +54,7 @@ Module(
 ## Unsupported Syntax Errors
 
   |
-1 | # parse_options: { "target_version": "3.7" }
+1 | # parse_options: { "target-version": "3.7" }
 2 | if x := 1: ...
   |    ^^^^^^ Syntax Error: Cannot use named assignment expression (`:=`) on Python 3.7 (syntax was added in Python 3.8)
   |