diff --git a/programs/test/CMakeLists.txt b/programs/test/CMakeLists.txt
index c05b903..758b7a5 100644
--- a/programs/test/CMakeLists.txt
+++ b/programs/test/CMakeLists.txt
@@ -30,6 +30,7 @@
 
 if(OPENSSL_FOUND)
     add_executable(o_p_test o_p_test.c)
+    include_directories(${OPENSSL_INCLUDE_DIR})
     target_link_libraries(o_p_test ${libs} ${OPENSSL_LIBRARIES})
 
     install(TARGETS o_p_test
diff --git a/programs/test/o_p_test.c b/programs/test/o_p_test.c
index edb3107..0c543c7 100644
--- a/programs/test/o_p_test.c
+++ b/programs/test/o_p_test.c
@@ -34,7 +34,9 @@
 #include <sys/stat.h>
 
 #include <openssl/rsa.h>
+#ifndef OPENSSL_NO_ENGINE
 #include <openssl/engine.h>
+#endif
 #include <openssl/pem.h>
 #include <openssl/bio.h>