diff --git a/CMakeLists.txt b/CMakeLists.txt
index b53e270bf..eeca45548 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -24,6 +24,7 @@ find_package(LLBuild QUIET)
 find_package(ArgumentParser CONFIG REQUIRED)
 find_package(SwiftCollections QUIET)
 find_package(SwiftSyntax CONFIG REQUIRED)
+find_package(SwiftASN1 CONFIG REQUIRED)
 find_package(SwiftCrypto CONFIG REQUIRED)
 
 include(SwiftSupport)