diff --git a/crypto/CMakeLists.txt b/crypto/CMakeLists.txt
index 3b98841..c21fce5 100644
--- a/crypto/CMakeLists.txt
+++ b/crypto/CMakeLists.txt
@@ -930,9 +930,13 @@ else()
 endif()
 
 if(NOT "${OPENSSLDIR}" STREQUAL "")
-	add_definitions(-DOPENSSLDIR=${OPENSSLDIR})
+	add_definitions(-DOPENSSLDIR=\"${OPENSSLDIR}\")
 else()
-	add_definitions(-DOPENSSLDIR=${CMAKE_INSTALL_PREFIX}/etc/ssl)
+	if(WIN32)
+		add_definitions(-DOPENSSLDIR=C:/libressl/ssl)
+	else()
+		add_definitions(-DOPENSSLDIR=\"${CMAKE_INSTALL_PREFIX}/etc/ssl\")
+	endif()
 endif()
 
 file(READ ${CMAKE_CURRENT_SOURCE_DIR}/crypto.sym SYMS)