diff --git a/source/build/src/defs.cpp b/source/build/src/defs.cpp
index 3d21b3cf8..363ced099 100644
--- a/source/build/src/defs.cpp
+++ b/source/build/src/defs.cpp
@@ -847,7 +847,7 @@ static int32_t defsparser(scriptfile *script)
                            script->filename, scriptfile_getlinum(script,texturetokptr));
             if (texstatus == -(3<<8))
                 Printf("Error: \"%s\" has more than one tile, in tilefromtexture definition near line %s:%d\n",
-                           fn, script->filename, scriptfile_getlinum(script,texturetokptr));
+                           fn.GetChars(), script->filename, scriptfile_getlinum(script,texturetokptr));
             if (texstatus < 0)
                 break;
 
@@ -986,7 +986,7 @@ static int32_t defsparser(scriptfile *script)
                            script->filename, scriptfile_getlinum(script,cmdtokptr));
             if (texstatus == -(3<<8))
                 Printf("Error: \"%s\" has more than one tile, in importtile definition near line %s:%d\n",
-                           fn, script->filename, scriptfile_getlinum(script,cmdtokptr));
+                           fn.GetChars(), script->filename, scriptfile_getlinum(script,cmdtokptr));
             if (texstatus < 0)
                 break;
 
@@ -2648,7 +2648,7 @@ static int32_t defsparser(scriptfile *script)
                     FileReader fil = fileSystem.OpenFileReader(fn);
                     if (!fil.isOpen())
                     {
-                        Printf("Error: basepalette: Failed opening \"%s\" on line %s:%d\n", fn,
+                        Printf("Error: basepalette: Failed opening \"%s\" on line %s:%d\n", fn.GetChars(),
                                    script->filename, scriptfile_getlinum(script,cmdtokptr));
                         break;
                     }
@@ -2820,7 +2820,7 @@ static int32_t defsparser(scriptfile *script)
                     FileReader fil = fileSystem.OpenFileReader(fn);
                     if (!fil.isOpen())
                     {
-                        Printf("Error: palookup: Failed opening \"%s\" on line %s:%d\n", fn,
+                        Printf("Error: palookup: Failed opening \"%s\" on line %s:%d\n", fn.GetChars(),
                                    script->filename, scriptfile_getlinum(script,cmdtokptr));
                         break;
                     }
@@ -3105,7 +3105,7 @@ static int32_t defsparser(scriptfile *script)
                     FileReader fil = fileSystem.OpenFileReader(fn);
                     if (!fil.isOpen())
                     {
-                        Printf("Error: blendtable: Failed opening \"%s\" on line %s:%d\n", fn,
+                        Printf("Error: blendtable: Failed opening \"%s\" on line %s:%d\n", fn.GetChars(),
                                    script->filename, scriptfile_getlinum(script,cmdtokptr));
                         break;
                     }