diff --git a/library/ecp_curves.c b/library/ecp_curves.c
index 20581f1f8b..3c38f3a305 100644
--- a/library/ecp_curves.c
+++ b/library/ecp_curves.c
@@ -5019,7 +5019,7 @@ int mbedtls_ecp_mod_p192_raw(mbedtls_mpi_uint *Np, size_t Nn)
 
 #else /* 64 bit */
 
-#define MAX32   ((X_limbs) * 2)
+#define MAX32   (X_limbs * 2)
 #define A(j)                                                \
     (j) % 2 ?                                               \
     (uint32_t) (X[(j) / 2] >> 32) :                         \