diff --git a/Source/lang.cpp b/Source/lang.cpp
index d1c486a3..bbc7ebc4 100644
--- a/Source/lang.cpp
+++ b/Source/lang.cpp
@@ -494,7 +494,7 @@ int CEXEBuild::SetLangString(TCHAR *name, LANGID lang, const TCHAR *str, BOOL un
   int sn;
 
   if (_tcsclen(str) > NSIS_MAX_STRLEN-1)
-    warning_fl("LangString \"%s\" longer than NSIS_MAX_STRLEN!", name);
+    warning_fl(_T("LangString \"%s\" longer than NSIS_MAX_STRLEN!"), name);
 
   int pos = build_langstrings.get(name, &sn);
   if (pos < 0)
diff --git a/Source/script.cpp b/Source/script.cpp
index f309624e..2d07f49b 100644
--- a/Source/script.cpp
+++ b/Source/script.cpp
@@ -553,7 +553,7 @@ parse_again:
             PRINTHELP()
         }
         if (!cnv1 || !cnv2) {
-          warning_fl("Invalid number: \"%s\"", line.gettoken_str(!cnv1 ? 1 : 3));
+          warning_fl(_T("Invalid number: \"%s\""), line.gettoken_str(!cnv1 ? 1 : 3));
         }
       }
       else PRINTHELP()