diff --git a/tests/unit/cli/vyper_json/test_compile_json.py b/tests/unit/cli/vyper_json/test_compile_json.py
index fc7483eabc..3c0b356e9b 100644
--- a/tests/unit/cli/vyper_json/test_compile_json.py
+++ b/tests/unit/cli/vyper_json/test_compile_json.py
@@ -403,6 +403,46 @@ def test_compile_json_with_experimental_codegen():
     assert venom["cfg_runtime"] == expected["cfg_runtime"]
 
 
+def test_compile_json_subgraph_label():
+    foo_code = """
+a: uint256
+b: address
+
+@internal
+def _foo(f: uint256, g: address) -> uint256:
+    self.a = f
+    self.b = g
+    return self.a
+
+
+@internal
+def _bar(f: uint256, g: address) -> uint256:
+    self._foo(f, g)
+    self._foo(f, g)
+    return self.a
+
+
+@external
+def call_foo(amount: uint256, account: address) -> uint256:
+    return self._bar(amount, account)
+    """
+    code = {
+        "language": "Vyper",
+        "sources": {"foo.vy": {"content": foo_code}},
+        "settings": {
+            "evmVersion": "cancun",
+            "optimize": "gas",
+            "venomExperimental": True,
+            "search_paths": ["."],
+            "outputSelection": {"*": ["cfg_runtime"]},
+        },
+    }
+    output_json = compile_json(code)
+    venom = output_json["contracts"]["foo.vy"]["foo"]["venom"]
+    # ensure that quotes are formatted properly in the output
+    assert 'subgraph "internal 0 _foo(uint256,address)_runtime"' in venom["cfg_runtime"]
+
+
 def test_compile_json_without_experimental_codegen():
     code = {
         "language": "Vyper",
diff --git a/vyper/venom/function.py b/vyper/venom/function.py
index 3ad63b207a..c57229eabc 100644
--- a/vyper/venom/function.py
+++ b/vyper/venom/function.py
@@ -192,7 +192,7 @@ def _make_label(bb):
 
         if not only_subgraph:
             ret.append("digraph G {{")
-        ret.append(f'subgraph "{self.name}" {{')
+        ret.append(f"subgraph {repr(self.name)} {{")
 
         for bb in self.get_basic_blocks():
             for out_bb in bb.out_bbs: