diff --git a/src/linux_sysfs.c b/src/linux_sysfs.c
index d62f48c..20c800e 100644
--- a/src/linux_sysfs.c
+++ b/src/linux_sysfs.c
@@ -462,7 +462,7 @@ pci_device_linux_sysfs_read( struct pci_device * dev, void * data,
 
 
     while ( temp_size > 0 ) {
-	const ssize_t bytes = pread64( fd, data_bytes, temp_size, offset );
+	const ssize_t bytes = pread( fd, data_bytes, temp_size, offset );
 
 	/* If zero bytes were read, then we assume it's the end of the
 	 * config file.
@@ -522,7 +522,7 @@ pci_device_linux_sysfs_write( struct pci_device * dev, const void * data,
 
 
     while ( temp_size > 0 ) {
-	const ssize_t bytes = pwrite64( fd, data_bytes, temp_size, offset );
+	const ssize_t bytes = pwrite( fd, data_bytes, temp_size, offset );
 
 	/* If zero bytes were written, then we assume it's the end of the
 	 * config file.