diff --git a/library/CMakeLists.txt b/library/CMakeLists.txt
index 378cfb4570..aed4a05c47 100644
--- a/library/CMakeLists.txt
+++ b/library/CMakeLists.txt
@@ -89,6 +89,7 @@ set(src_crypto
 )
 
 set(src_x509
+    pkcs7.c
     x509.c
     x509_create.c
     x509_crl.c