diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 66589729..2ad6e4e3 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -14,14 +14,17 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        build: [stable, 1.70.0, beta, nightly, macos, windows]
+        build: [stable, msrv-linux, msrv-windows, beta, nightly, macos, windows]
         include:
           - build: stable
             os: ubuntu-latest
             rust: stable
-          - build: 1.70.0
+          - build: msrv-linux
             os: ubuntu-latest
             rust: 1.70.0
+          - build: msrv-windows
+            os: windows-latest
+            rust: 1.70.0
           - build: beta
             os: ubuntu-latest
             rust: beta
diff --git a/tests/socket.rs b/tests/socket.rs
index 133fab27..ec79ece4 100644
--- a/tests/socket.rs
+++ b/tests/socket.rs
@@ -446,9 +446,9 @@ where
             socket.as_raw_socket() as _,
             WinSock::SIO_GET_MULTIPLE_EXTENSION_FUNCTION_POINTER,
             (&guid as *const GUID) as *const _,
-            size_of_val(&guid) as u32,
+            mem::size_of_val(&guid) as u32,
             table.as_mut_ptr() as *mut _,
-            size_of_val(&table) as u32,
+            mem::size_of_val(&table) as u32,
             (&mut bytes as *mut i32) as *mut _,
             ptr::null_mut(),
             None,