diff --git a/programs/ssl/ssl_client2.c b/programs/ssl/ssl_client2.c
index a499c990a3..dcf94f8948 100644
--- a/programs/ssl/ssl_client2.c
+++ b/programs/ssl/ssl_client2.c
@@ -1570,7 +1570,7 @@ int main( int argc, char *argv[] )
 #else
     {
         ret = 1;
-        mbedtls_printf("MBEDTLS_CERTS_C not defined.");
+        mbedtls_printf( "MBEDTLS_CERTS_C not defined." );
     }
 #endif
     if( ret != 0 )
@@ -1595,7 +1595,7 @@ int main( int argc, char *argv[] )
 #else
     {
         ret = 1;
-        mbedtls_printf("MBEDTLS_CERTS_C not defined.");
+        mbedtls_printf( "MBEDTLS_CERTS_C not defined." );
     }
 #endif
     if( ret != 0 )
diff --git a/programs/ssl/ssl_server2.c b/programs/ssl/ssl_server2.c
index f46ee34706..d2f5474d36 100644
--- a/programs/ssl/ssl_server2.c
+++ b/programs/ssl/ssl_server2.c
@@ -2369,7 +2369,7 @@ int main( int argc, char *argv[] )
 #else
     {
         ret = 1;
-        mbedtls_printf("MBEDTLS_CERTS_C not defined.");
+        mbedtls_printf( "MBEDTLS_CERTS_C not defined." );
     }
 #endif /* MBEDTLS_CERTS_C */
     if( ret < 0 )