diff --git a/cmake/modules/FindOpenSSL.cmake b/cmake/modules/FindOpenSSL.cmake
index 6fb1c82efb..8298cc75b4 100644
--- a/cmake/modules/FindOpenSSL.cmake
+++ b/cmake/modules/FindOpenSSL.cmake
@@ -183,8 +183,8 @@ endfunction()
 if (OPENSSL_INCLUDE_DIR)
   if(OPENSSL_INCLUDE_DIR AND EXISTS "${OPENSSL_INCLUDE_DIR}/openssl/opensslv.h")
     file(STRINGS "${OPENSSL_INCLUDE_DIR}/openssl/opensslv.h" openssl_version_str
-         REGEX "^#define[\t ]+OPENSSL_VERSION_NUMBER[\t ]+0x([0-9a-fA-F])+.*")
-
+         REGEX "^#[ ]?define[\t ]+OPENSSL_VERSION_NUMBER[\t ]+0x([0-9a-fA-F])+.*")
+    
     # The version number is encoded as 0xMNNFFPPS: major minor fix patch status
     # The status gives if this is a developer or prerelease and is ignored here.
     # Major, minor, and fix directly translate into the version numbers shown in