diff --git a/gtk/gui.cpp b/gtk/gui.cpp
index ec43bf5..5940e3e 100644
--- a/gtk/gui.cpp
+++ b/gtk/gui.cpp
@@ -18,17 +18,17 @@ int main( int argc, char **argv ) {
         argc, argv, "org.idonthaveanorganization.tvrename" );
 
     if ( setlocale( LC_ALL, "" ) == NULL )
-        error( 1, errno, _( INVALID_LOCALE ).c_str() );
+        error( 1, errno, "%s", _( INVALID_LOCALE ).c_str() );
     if ( FSLib::exists( "/usr/share/locale/en_US/LC_MESSAGES/tv_rename.mo" ) ) {
         if ( bindtextdomain( DOMAIN, "/usr/share/locale" ) == NULL )
-            error( 1, errno, _( MEM_ALLOC_FAILED ).c_str() );
+            error( 1, errno, "%s", _( MEM_ALLOC_FAILED ).c_str() );
         if ( textdomain( DOMAIN ) == NULL )
-            error( 1, errno, _( MEM_ALLOC_FAILED ).c_str() );
+            error( 1, errno, "%s", _( MEM_ALLOC_FAILED ).c_str() );
     } else {
         if ( bindtextdomain( DOMAIN, "./locale" ) == NULL )
-            error( 1, errno, _( MEM_ALLOC_FAILED ).c_str() );
+            error( 1, errno, "%s", _( MEM_ALLOC_FAILED ).c_str() );
         if ( textdomain( DOMAIN ) == NULL )
-            error( 1, errno, _( MEM_ALLOC_FAILED ).c_str() );
+            error( 1, errno, "%s", _( MEM_ALLOC_FAILED ).c_str() );
     }
 
     // TODO let user know that program is authenticating and will start shortly