diff --git a/Modules/FindOpenSSL.cmake b/Modules/FindOpenSSL.cmake
index 550528278..07505920d 100644
--- a/Modules/FindOpenSSL.cmake
+++ b/Modules/FindOpenSSL.cmake
@@ -220,7 +220,7 @@ if (OPENSSL_INCLUDE_DIR)
     set(OPENSSL_VERSION "${_OPENSSL_VERSION}")
   elseif(OPENSSL_INCLUDE_DIR AND EXISTS "${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[0-9][0-9][0-9][0-9][0-9][0-9].*")
+         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.
@@ -229,7 +229,7 @@ if (OPENSSL_INCLUDE_DIR)
     # indicates the bug fix state, which 00 -> nothing, 01 -> a, 02 -> b and so
     # on.
 
-    string(REGEX REPLACE "^.*OPENSSL_VERSION_NUMBER[\t ]+0x([0-9a-f])([0-9a-f][0-9a-f])([0-9a-f][0-9a-f])([0-9a-f][0-9a-f])([0-9a-f]).*$"
+    string(REGEX REPLACE "^.*OPENSSL_VERSION_NUMBER[\t ]+0x([0-9a-fA-F])([0-9a-fA-F][0-9a-fA-F])([0-9a-fA-F][0-9a-fA-F])([0-9a-fA-F][0-9a-fA-F])([0-9a-fA-F]).*$"
            "\\1;\\2;\\3;\\4;\\5" OPENSSL_VERSION_LIST "${openssl_version_str}")
     list(GET OPENSSL_VERSION_LIST 0 OPENSSL_VERSION_MAJOR)
     list(GET OPENSSL_VERSION_LIST 1 OPENSSL_VERSION_MINOR)