diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 22082ab..4f21b9a 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -15,7 +15,8 @@ jobs:
         image:
           - swift:5.9-focal
           - swift:5.9-jammy
-          - swift:5.9-amazonlinux2
+          - swift:5.10-focal
+          - swift:5.10-jammy
     container: ${{ matrix.image }}
     steps:
     - name: Checkout code
diff --git a/Sources/JSONAPISwiftGen/Swift Generators/Test Generators/TestFunctionName.swift b/Sources/JSONAPISwiftGen/Swift Generators/Test Generators/TestFunctionName.swift
index 8dc8860..8e97eca 100644
--- a/Sources/JSONAPISwiftGen/Swift Generators/Test Generators/TestFunctionName.swift	
+++ b/Sources/JSONAPISwiftGen/Swift Generators/Test Generators/TestFunctionName.swift	
@@ -152,6 +152,7 @@ public struct TestFunctionName: Equatable, RawRepresentable {
         if string == "do" { return "`do`" }
         if string == "try" { return "`try`" }
         if string == "continue" { return "`continue`" }
+        if string == "_" { return "`_`" }
         return string
     }
 
diff --git a/Tests/JSONAPISwiftGenTests/TestFunctionNameTests.swift b/Tests/JSONAPISwiftGenTests/TestFunctionNameTests.swift
index 5564ab8..fb11533 100644
--- a/Tests/JSONAPISwiftGenTests/TestFunctionNameTests.swift
+++ b/Tests/JSONAPISwiftGenTests/TestFunctionNameTests.swift
@@ -95,11 +95,14 @@ final class TestFunctionNameTests: XCTestCase {
 
     func test_reservedWordsInPath() {
         let t1 = TestFunctionName(
-            path: .init(["go", "continue", "do", "try", "accept"]),
+            path: .init(["go", "_", "continue", "do", "try", "accept"]),
             endpoint: .post,
             direction: .request,
             context: TestFunctionLocalContext(functionName: "_hello_world➎")!
         )
+        XCTAssertTrue(t1.fullyQualifiedTestFunctionName.contains("go."))
+
+        XCTAssertFalse(t1.fullyQualifiedTestFunctionName.contains("._."))
         XCTAssertFalse(t1.fullyQualifiedTestFunctionName.contains(".do."))
         XCTAssertFalse(t1.fullyQualifiedTestFunctionName.contains(".continue."))
         XCTAssertFalse(t1.fullyQualifiedTestFunctionName.contains(".try."))