diff --git a/packages/migrate/src/sources/conductor/project-config.test.ts b/packages/migrate/src/sources/conductor/project-config.test.ts
index 2f8dbe8fd4..d344a6c8fc 100644
--- a/packages/migrate/src/sources/conductor/project-config.test.ts
+++ b/packages/migrate/src/sources/conductor/project-config.test.ts
@@ -158,6 +158,9 @@ test("preserves literal or escaped Conductor names and rewrites active variables
         bare: { command: "printf CONDUCTOR_PORT" },
         heredoc: { command: "cat <<'EOF'\n$CONDUCTOR_PORT\nEOF" },
         active: { command: "printf \"'$CONDUCTOR_PORT'\"" },
+        arithmeticDirect: { command: "serve --port $(( $CONDUCTOR_PORT ))" },
+        arithmeticBraced: { command: "serve --port $(( ${CONDUCTOR_PORT} ))" },
+        arithmeticOffset: { command: "serve --port $(( CONDUCTOR_PORT + 1 ))" },
       },
     },
   });
@@ -166,6 +169,8 @@ test("preserves literal or escaped Conductor names and rewrites active variables
     worktree: { setup: "printf '%s\\n' '$CONDUCTOR_WORKSPACE_PATH'" },
     scripts: {
       active: { command: "printf \"'$PASEO_PORT'\"", type: "service" },
+      arithmeticBraced: { command: "serve --port $(( ${PASEO_PORT} ))", type: "service" },
+      arithmeticDirect: { command: "serve --port $(( $PASEO_PORT ))", type: "service" },
       bare: { command: "printf CONDUCTOR_PORT" },
       escaped: { command: "printf \\$CONDUCTOR_PORT" },
       escapedDouble: { command: 'printf "\\$CONDUCTOR_PORT"' },
@@ -176,6 +181,12 @@ test("preserves literal or escaped Conductor names and rewrites active variables
     level: "warning",
     message: "scripts.heredoc: Here-document commands are not imported.",
   });
+  expect(inspected.notices).toContainEqual({
+    code: "conductor-setting-unsupported",
+    level: "warning",
+    message:
+      "scripts.arithmeticOffset.port_arithmetic: Conductor port arithmetic is not imported because Paseo reserves one service port.",
+  });
 });
 
 test("skips cwd scripts on Windows instead of emitting POSIX shell syntax", () => {
diff --git a/packages/migrate/src/sources/conductor/project-config.ts b/packages/migrate/src/sources/conductor/project-config.ts
index 3b8e63f335..1e8fa3645c 100644
--- a/packages/migrate/src/sources/conductor/project-config.ts
+++ b/packages/migrate/src/sources/conductor/project-config.ts
@@ -703,10 +703,11 @@ function containsArithmeticVariable(command: string, name: string): boolean {
 
 function containsArithmeticVariableOperation(command: string, name: string): boolean {
   const identifier = new RegExp(`(^|[^A-Za-z0-9_])${name}(?![A-Za-z0-9_])`);
+  const directVariable = new RegExp(`^(?:${name}|\\$${name}|\\$\\{${name}\\})$`);
   let found = false;
   forEachActiveArithmetic(command, (value) => {
     const body = value.trim();
-    if (identifier.test(body) && body !== name) found = true;
+    if (identifier.test(body) && !directVariable.test(body)) found = true;
   });
   return found;
 }