diff --git a/utils/build.ps1 b/utils/build.ps1
index d8455f155b4a5..8a03eeaf88e4d 100644
--- a/utils/build.ps1
+++ b/utils/build.ps1
@@ -2944,6 +2944,7 @@ function Build-SourceKitLSP([Hashtable] $Platform) {
       TSC_DIR = (Get-ProjectCMakeModules $Platform ToolsSupportCore);
       LLBuild_DIR = (Get-ProjectCMakeModules $Platform LLBuild);
       ArgumentParser_DIR = (Get-ProjectCMakeModules $Platform ArgumentParser);
+      SwiftASN1_DIR = (Get-ProjectCMakeModules $Platform ASN1);
       SwiftCrypto_DIR = (Get-ProjectCMakeModules $Platform Crypto);
       SwiftCollections_DIR = (Get-ProjectCMakeModules $Platform Collections);
       SwiftBuild_DIR = (Get-ProjectCMakeModules $Platform Build);
@@ -2985,6 +2986,9 @@ function Test-SourceKitLSP {
     "-Xswiftc", "-I$(Get-ProjectBinaryCache $BuildPlatform Crypto)\swift",
     "-Xlinker", "-L$(Get-ProjectBinaryCache $BuildPlatform Crypto)\lib",
     "-Xlinker", "$(Get-ProjectBinaryCache $BuildPlatform Crypto)\lib\CCryptoBoringSSL.lib",
+    # swift-asn1
+    "-Xswiftc", "-I$(Get-ProjectBinaryCache $BuildPlatform ASN1)\swift",
+    "-Xlinker", "-L$(Get-ProjectBinaryCache $BuildPlatform ASN1)\lib",
     # swift-package-manager
     "-Xswiftc", "-I$(Get-ProjectBinaryCache $BuildPlatform PackageManager)\swift",
     "-Xlinker", "-L$(Get-ProjectBinaryCache $BuildPlatform PackageManager)\lib",