--- a/src/dostextfile.c
+++ b/src/dostextfile.c
@@ -30,14 +30,14 @@
 /* Write a string to the file pointed to by b without the eoln. */
 void write_dostextfile(FILE *b, char *data)
 {
-   fprintf( b, data );
+   fprintf( b, "%s", data );
    fflush( b );
 }
 
 /* Write a string to the file pointed to by b with the eoln. */
 void writeln_dostextfile(FILE *b, char *data)
 {
-   fprintf( b, data );
+   fprintf( b, "%s", data );
    fputc( 0x0d, b );
    fputc( 0x0a, b );
    fflush( b );
--- a/src/interface.c
+++ b/src/interface.c
@@ -216,6 +216,7 @@
                                     GTK_DIALOG_MODAL,
                                     GTK_MESSAGE_ERROR,
                                     GTK_BUTTONS_CLOSE,
+                                    "%s", 
                                     error );
                                     
    /* Display the error dialog. */  
@@ -233,12 +234,14 @@
                                        GTK_DIALOG_MODAL,
                                        GTK_MESSAGE_INFO,
                                        GTK_BUTTONS_CLOSE,
+                                       "%s",
                                        "File verification successful" );
    else
       dialog = gtk_message_dialog_new( NULL,
                                        GTK_DIALOG_MODAL,
                                        GTK_MESSAGE_WARNING,
                                        GTK_BUTTONS_CLOSE,
+				       "%s",
                                        "File verification unsuccessful" );
                                     
    /* Display the error dialog. */