diff --git a/test/Makefile.ssl b/test/Makefile.ssl
index b5c23a6..1dc1edf 100644
--- a/test/Makefile.ssl
+++ b/test/Makefile.ssl
@@ -136,8 +136,9 @@
 		DYLD_LIBRARY_PATH="$$OSSL_LIBPATH:$$DYLD_LIBRARY_PATH"; \
 		SHLIB_PATH="$$OSSL_LIBPATH:$$SHLIB_PATH"; \
 		LIBPATH="$$OSSL_LIBPATH:$$LIBPATH"; \
+		LD_PRELOAD="$$OSSL_LIBPATH/libssl.so $$OSSL_LIBPATH/libcrypto.so"; \
 		if [ "$(PLATFORM)" = "Cygwin" ]; then PATH="$${LIBPATH}:$$PATH"; fi; \
-		export LD_LIBRARY_PATH DYLD_LIBRARY_PATH SHLIB_PATH LIBPATH PATH
+		export LD_LIBRARY_PATH DYLD_LIBRARY_PATH SHLIB_PATH LIBPATH PATH LD_PRELOAD
 
 alltests: \
 	test_des test_idea test_sha test_md4 test_md5 test_hmac \