diff --git a/.github/workflows/pull_request.yml b/.github/workflows/pull_request.yml
index cd669b492..0df6f3b8b 100644
--- a/.github/workflows/pull_request.yml
+++ b/.github/workflows/pull_request.yml
@@ -12,6 +12,7 @@ jobs:
       linux_exclude_swift_versions: '[{"swift_version": "5.9"}, {"swift_version": "5.10"}]'
       enable_windows_checks: false
       enable_macos_checks: false
+      enable_wasm_sdk_build: true
   soundness:
     name: Soundness
     uses: swiftlang/github-workflows/.github/workflows/soundness.yml@main
diff --git a/Sources/TestSupport/TestSupport.swift b/Sources/TestSupport/TestSupport.swift
index fc9353f32..d720aac4a 100644
--- a/Sources/TestSupport/TestSupport.swift
+++ b/Sources/TestSupport/TestSupport.swift
@@ -15,7 +15,7 @@ import XCTest
 // *without* `-disable-availability-checking` to ensure the #available check is
 // not compiled into a no-op.
 
-#if os(Linux) || os(Android) || os(Windows)
+#if os(Linux) || os(Android) || os(Windows) || os(WASI)
 public func XCTExpectFailure(
   _ message: String? = nil, body: () throws -> Void
 ) rethrows {}
diff --git a/Sources/VariadicsGenerator/VariadicsGenerator.swift b/Sources/VariadicsGenerator/VariadicsGenerator.swift
index b1953bcd4..3e91294ad 100644
--- a/Sources/VariadicsGenerator/VariadicsGenerator.swift
+++ b/Sources/VariadicsGenerator/VariadicsGenerator.swift
@@ -20,6 +20,8 @@ import Glibc
 import CRT
 #elseif canImport(Bionic)
 import Bionic
+#elseif os(WASI)
+import WASILibc
 #endif
 
 // (T), (T)