diff --git a/library/rsa.c b/library/rsa.c
index afe5fc3..bff6d7d 100644
--- a/library/rsa.c
+++ b/library/rsa.c
@@ -306,7 +306,7 @@
 /*
  * Generate or update blinding values, see section 10 of:
  *  KOCHER, Paul C. Timing attacks on implementations of Diffie-Hellman, RSA,
- *  DSS, and other systems. In : Advances in Cryptology—CRYPTO’96. Springer
+ *  DSS, and other systems. In : Advances in Cryptology-CRYPTO'96. Springer
  *  Berlin Heidelberg, 1996. p. 104-113.
  */
 static int rsa_prepare_blinding( rsa_context *ctx, mpi *Vi, mpi *Vf,