diff --git a/SPPI.cpp b/SPPI.cpp
index 2eaa03d..7dd11ba 100644
--- a/SPPI.cpp
+++ b/SPPI.cpp
@@ -21,7 +21,7 @@ void SPPI::__init(int __mode, int __bits_per_word, int __max_speed_hz) {
 		throw std::system_error(errno, std::system_category(), "failed to get page size");
 
 	fd = open(path_.c_str(), O_RDWR);
-	if (page_size == -1)
+	if (fd == -1)
 		throw std::system_error(errno, std::system_category(), "failed to open device");
 
 	if (__mode > 0)