diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 3462b17..1822c11 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -19,6 +19,10 @@ on:
         description: "Build and include QuantLib test suite"
         type: boolean
         default: true
+      run_tests:
+        description: "Run the QuantLib test suite after building"
+        type: boolean
+        default: false
       create_release:
         description: "Create a GitHub Release with the zip asset"
         type: boolean
@@ -43,7 +47,10 @@ jobs:
       - name: Build QuantLib DLL
         shell: pwsh
         run: |
-          $buildTestsFlag = if ("${{ inputs.build_tests }}" -eq "true") { "-BuildTests" } else { "" }
+          $buildTests = "${{ inputs.build_tests }}" -ne "false"
+          $runTests   = "${{ inputs.run_tests }}"   -eq "true"
+          $buildTestsFlag = if ($buildTests) { "-BuildTests" } else { "" }
+          $runTestsFlag   = if ($runTests)   { "-RunTests"   } else { "" }
           $cmd = "scripts/Build-QuantLibDLL.ps1" +
             " -QuantLibVersion $env:QL_VERSION" +
             " -BoostVersion $env:BOOST_VERSION" +
@@ -51,7 +58,7 @@ jobs:
             " -TempDir ${{ runner.temp }}\quantlib-build" +
             " -PackageZip" +
             " -ZipOutputDir ${{ github.workspace }}" +
-            " $buildTestsFlag"
+            " $buildTestsFlag $runTestsFlag"
           Write-Host "Running: $cmd"
           Invoke-Expression $cmd
 
diff --git a/scripts/Build-QuantLibDLL.ps1 b/scripts/Build-QuantLibDLL.ps1
index 77b9b79..c6247da 100644
--- a/scripts/Build-QuantLibDLL.ps1
+++ b/scripts/Build-QuantLibDLL.ps1
@@ -38,6 +38,9 @@
 .PARAMETER BuildTests
     Also build the QuantLib test suite.
 
+.PARAMETER RunTests
+    Run the QuantLib test suite after building. Implies -BuildTests.
+
 .PARAMETER PackageZip
     Create a distributable zip containing QuantLib DLL + headers + Boost headers.
 
@@ -59,12 +62,16 @@ param(
     [string]$TempDir         = (Join-Path (Split-Path $PSScriptRoot) "build"),
     [int]$Jobs               = 0,
     [switch]$BuildTests,
+    [switch]$RunTests,
     [switch]$PackageZip,
     [string]$ZipOutputDir    = "."
 )
 
 $ErrorActionPreference = "Stop"
 
+# -RunTests implies -BuildTests
+if ($RunTests) { $BuildTests = [switch]::new($true) }
+
 $BoostVersionU = $BoostVersion -replace '\.', '_'
 if ($Jobs -eq 0) {
     $Jobs = (Get-CimInstance Win32_Processor).NumberOfLogicalProcessors
@@ -215,9 +222,13 @@ $ppContent = Get-Content $ppHeader -Raw
 if (-not $ppContent.Contains('qldefines.hpp')) {
     $ppContent = $ppContent -replace '(#define\s+primitivepolynomials_hpp)', "`$1`n`n#include <ql/qldefines.hpp>"
 }
-$ppContent = $ppContent.Replace(
-    'extern const long *const PrimitivePolynomials',
-    'extern QL_EXPORT const long *const PrimitivePolynomials')
+if (-not $ppContent.Contains('QL_EXPORT')) {
+    # NOTE: The declaration uses multi-line "extern ... 'C' ... const long *const"
+    # so we must match just "const long *const PrimitivePolynomials" (not "extern const ...").
+    $ppContent = $ppContent.Replace(
+        'const long *const PrimitivePolynomials',
+        'QL_EXPORT const long *const PrimitivePolynomials')
+}
 [System.IO.File]::WriteAllText($ppHeader, $ppContent)
 
 # ==========================================================================
@@ -236,7 +247,7 @@ $cmakeArgs = @(
     "-DCMAKE_WINDOWS_EXPORT_ALL_SYMBOLS=ON"
     '-DCMAKE_MSVC_RUNTIME_LIBRARY=MultiThreaded$<$<CONFIG:Debug>:Debug>DLL'
     "-DBoost_INCLUDE_DIR=$BoostIncludeDir"
-    "-DQL_BUILD_BENCHMARK=OFF"
+    "-DQL_INSTALL_BENCHMARK=OFF"
     "-DQL_BUILD_EXAMPLES=OFF"
     "-DQL_BUILD_TEST_SUITE=$( if ($BuildTests) { 'ON' } else { 'OFF' } )"
     "-Wno-dev"
@@ -300,7 +311,38 @@ if (Test-Path "$InstallDir\bin") {
 }
 
 # ==========================================================================
-# 6. Package zip (optional)
+# 6. Run test suite (optional)
+# ==========================================================================
+if ($RunTests) {
+    Write-Host "==> Running QuantLib test suite"
+    $TestExePath = Get-ChildItem -Recurse "$QLBuildDir\test-suite" -Filter "quantlib-test-suite.exe" |
+                   Where-Object { $_.Directory.Name -eq "Release" } | Select-Object -First 1
+    if (-not $TestExePath) {
+        throw "quantlib-test-suite.exe not found under $QLBuildDir\test-suite"
+    }
+    Write-Host "  Executable: $($TestExePath.FullName)"
+
+    # Add the DLL directory to PATH so the test can find the QuantLib DLL
+    $DllDir = (Get-ChildItem -Recurse $QLBuildDir -Filter "QuantLib*.dll" |
+               Where-Object { $_.Directory.Name -eq "Release" } | Select-Object -First 1).DirectoryName
+    $env:PATH = "$DllDir;$env:PATH"
+    Write-Host "  DLL directory added to PATH: $DllDir"
+
+    $testOutput = & $TestExePath.FullName 2>&1 | Out-String
+    $testExitCode = $LASTEXITCODE
+    Write-Host $testOutput
+
+    if ($testExitCode -ne 0) {
+        throw "quantlib-test-suite.exe exited with code $testExitCode (expected 0)"
+    }
+    if ($testOutput -notmatch '\*\*\* No errors detected') {
+        throw "Test suite output did not contain '*** No errors detected'"
+    }
+    Write-Host "==> Test suite PASSED (exit code 0, no errors detected)"
+}
+
+# ==========================================================================
+# 7. Package zip (optional)
 # ==========================================================================
 if ($PackageZip) {
     Write-Host "==> Packaging distribution zip"