diff --git a/library/ecp_curves.c b/library/ecp_curves.c
index 55428d6d4..96aae3104 100644
--- a/library/ecp_curves.c
+++ b/library/ecp_curves.c
@@ -5593,7 +5593,7 @@ cleanup:
 
 /*
  * Fast quasi-reduction modulo p192k1 = 2^192 - R,
- * with R = 2^32 + 2^12 + 2^8 + 2^7 + 2^6 + 2^3 + 1 = 0x0100001119
+ * with R = 2^32 + 2^12 + 2^8 + 2^7 + 2^6 + 2^3 + 1 = 0x01000011C9
  */
 static int ecp_mod_p192k1(mbedtls_mpi *N)
 {