diff --git a/library/bignum_mod.h b/library/bignum_mod.h
index 37aa946..ce871a9 100644
--- a/library/bignum_mod.h
+++ b/library/bignum_mod.h
@@ -49,8 +49,8 @@
     mbedtls_mpi_uint *p;
 } mbedtls_mpi_mod_residue;
 
-typedef void* mbedtls_mpi_mont_struct;
-typedef void* mbedtls_mpi_opt_red_struct;
+typedef void *mbedtls_mpi_mont_struct;
+typedef void *mbedtls_mpi_opt_red_struct;
 
 typedef struct {
     mbedtls_mpi_uint *p;