diff --git a/library/pkparse.c b/library/pkparse.c
index f0a12f9..d427c52 100644
--- a/library/pkparse.c
+++ b/library/pkparse.c
@@ -101,7 +101,10 @@
     if( fread( *buf, 1, *n, f ) != *n )
     {
         fclose( f );
+
+        mbedtls_zeroize( *buf, *n );
         mbedtls_free( *buf );
+
         return( MBEDTLS_ERR_PK_FILE_IO_ERROR );
     }