diff --git a/programs/ssl/ssl_client2.c b/programs/ssl/ssl_client2.c
index 3f29ec5a..a3ffbaa2 100644
--- a/programs/ssl/ssl_client2.c
+++ b/programs/ssl/ssl_client2.c
@@ -1294,7 +1294,7 @@ 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 )
@@ -1319,7 +1319,7 @@ 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 bcfe025e..d370892f 100644
--- a/programs/ssl/ssl_server2.c
+++ b/programs/ssl/ssl_server2.c
@@ -2060,7 +2060,7 @@ 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 )