diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index afadfbc..8d7abfb 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -70,10 +70,9 @@ jobs:
 
       - name: Windows setup (bundled)
         if: runner.os == 'Windows' && matrix.features == 'bundled'
-        shell: bash
         run: |
-          echo "OPENSSL_RUST_USE_NASM=0" >> $GITHUB_ENV
-          echo OPENSSL_SRC_PERL=C:/Strawberry/perl/bin/perl >> $GITHUB_ENV
+          echo "VCPKG_ROOT=$env:VCPKG_INSTALLATION_ROOT" | Out-File -FilePath $env:GITHUB_ENV
+          vcpkg install openssl:x64-windows-static-md
 
       - name: Install rust toolchain
         uses: dtolnay/rust-toolchain@stable
@@ -89,7 +88,7 @@ jobs:
 
       - name: Test compile diesel
         shell: bash
-        # currently broken as diesel does not allow pq-sys 0.5 yet
+        # allow to fail as diesel might not pull in the right feature yet
         continue-on-error: true
         run: |
           cargo new test_diesel
diff --git a/pq-src/Cargo.toml b/pq-src/Cargo.toml
index 5fb055f..504e4f3 100644
--- a/pq-src/Cargo.toml
+++ b/pq-src/Cargo.toml
@@ -22,7 +22,7 @@ keywords = ["bindings", "libpq", "pq-sys", "bundled"]
 categories = ["database", "external-ffi-bindings"]
 readme = "README.md"
 
-[target.'cfg(not(target_os = "windows"))'.dependencies]
+[dependencies]
 openssl-sys = "0.9.93"
 
 [build-dependencies]
diff --git a/pq-src/additional_include/pg_config.h b/pq-src/additional_include/pg_config.h
index 87ff582..f89ff4d 100644
--- a/pq-src/additional_include/pg_config.h
+++ b/pq-src/additional_include/pg_config.h
@@ -212,11 +212,8 @@
 /* Define to 1 if you have the ANSI C header files. */
 #define STDC_HEADERS 1
 
-
-#ifndef __WIN32__
 /* Define to 1 to build with OpenSSL support. (--with-ssl=openssl) */
 #define USE_OPENSSL 1
-#endif
 
 /* Define WORDS_BIGENDIAN to 1 if your processor stores words with the most
    significant byte first (like Motorola and SPARC, unlike Intel). */
@@ -276,3 +273,7 @@
 #if defined _WIN32
 #define HAVE_INET_ATON 1
 #endif
+
+#if defined _WIN32
+#define HAVE_DECL_STRNLEN 1
+#endif
diff --git a/pq-src/build.rs b/pq-src/build.rs
index 8b91a20..699291f 100644
--- a/pq-src/build.rs
+++ b/pq-src/build.rs
@@ -48,6 +48,7 @@ const LIBPORTS_WINDOWS: &[&str] = &[
     "win32stat.c",
     "open.c",
     "dirmod.c",
+    "inet_aton.c",
 ];
 
 const LIBCOMMON_BASE: &[&str] = &[
@@ -78,22 +79,14 @@ const LIBCOMMON_BASE: &[&str] = &[
     "restricted_token.c",
     "sprompt.c",
     "logging.c",
-];
-
-const LIBCOMMON_NOT_WINDOWS: &[&str] = &[
     "cryptohash_openssl.c",
     "hmac_openssl.c",
     "protocol_openssl.c",
 ];
 
-const LIBCOMMON_WINDOWS: &[&str] = &[
-    "cryptohash.c",
-    "hmac.c",
-    "md5.c",
-    "sha1.c",
-    "sha2.c",
-    "wchar.c",
-];
+const LIBCOMMON_NOT_WINDOWS: &[&str] = &[];
+
+const LIBCOMMON_WINDOWS: &[&str] = &["wchar.c"];
 
 const LIBPQ_BASE: &[&str] = &[
     "fe-auth-scram.c",
@@ -109,9 +102,11 @@ const LIBPQ_BASE: &[&str] = &[
     "legacy-pqsignal.c",
     "libpq-events.c",
     "pqexpbuffer.c",
+    "fe-secure-common.c",
+    "fe-secure-openssl.c",
 ];
 
-const LIBPQ_NOT_WINDOWS: &[&str] = &["fe-secure-common.c", "fe-secure-openssl.c"];
+const LIBPQ_NOT_WINDOWS: &[&str] = &[];
 
 const LIBPQ_WINDOWS: &[&str] = &["fe-secure.c", "pthread-win32.c", "win32.c"];
 
@@ -173,6 +168,7 @@ fn main() {
         format!("{path}src/include"),
         format!("{crate_dir}/additional_include"),
         temp_include.clone(),
+        env::var("DEP_OPENSSL_INCLUDE").unwrap().clone(),
     ][..];
 
     let includes = if target_os == "windows" {
@@ -182,8 +178,7 @@ fn main() {
         ];
         [base_includes, includes_windows].concat()
     } else {
-        let includes_not_windows = &[env::var("DEP_OPENSSL_INCLUDE").unwrap().clone()];
-        [base_includes, includes_not_windows].concat()
+        base_includes.to_vec()
     };
 
     basic_build
diff --git a/pq-src/src/lib.rs b/pq-src/src/lib.rs
index c135f59..176961b 100644
--- a/pq-src/src/lib.rs
+++ b/pq-src/src/lib.rs
@@ -1,2 +1 @@
-#[cfg(not(target_os = "windows"))]
 extern crate openssl_sys;