diff --git a/Source/lang.cpp b/Source/lang.cpp
index efc06f42..7cadfa2c 100644
--- a/Source/lang.cpp
+++ b/Source/lang.cpp
@@ -476,12 +476,12 @@ int CEXEBuild::GenerateLangTables() {
         BYTE* dlg = res_editor->GetResource(RT_DIALOG, MAKEINTRESOURCE(id), NSIS_DEFAULT_LANG); \
         if (dlg) { \
           CDialogTemplate td(dlg); \
-          free(dlg); \
+          res_editor->FreeResource(dlg); \
           td.SetFont(build_font, build_font_size); \
           DWORD dwSize; \
           dlg = td.Save(dwSize); \
           res_editor->UpdateResource(RT_DIALOG, MAKEINTRESOURCE(id), NSIS_DEFAULT_LANG, dlg, dwSize); \
-          res_editor->FreeResource(dlg); \
+          delete [] dlg; \
         } \
       }
 
@@ -531,13 +531,13 @@ int CEXEBuild::GenerateLangTables() {
           BYTE* dlg = res_editor->GetResource(RT_DIALOG, MAKEINTRESOURCE(id), NSIS_DEFAULT_LANG); \
           if (dlg) { \
             CDialogTemplate td(dlg,lt[i].nlf.m_uCodePage); \
-            free(dlg); \
+            res_editor->FreeResource(dlg); \
             if (font) td.SetFont(font, lt[i].nlf.m_iFontSize); \
             if (lt[i].nlf.m_bRTL) td.ConvertToRTL(); \
             DWORD dwSize; \
             dlg = td.Save(dwSize); \
             res_editor->UpdateResource(RT_DIALOG, MAKEINTRESOURCE(id+cur_offset), NSIS_DEFAULT_LANG, dlg, dwSize); \
-            res_editor->FreeResource(dlg); \
+            delete [] dlg; \
           } \
         }
 
diff --git a/Source/script.cpp b/Source/script.cpp
index cc7fa642..948cfd07 100644
--- a/Source/script.cpp
+++ b/Source/script.cpp
@@ -1950,7 +1950,7 @@ int CEXEBuild::doCommand(int which_token, LineParser &line)
           DWORD dwSize;
           dlg = dt.Save(dwSize);
           res_editor->UpdateResource(RT_DIALOG, MAKEINTRESOURCE(IDD_INSTFILES), NSIS_DEFAULT_LANG, dlg, dwSize);
-          res_editor->FreeResource(dlg);
+          delete [] dlg;
         }
         catch (exception& err) {
           ERROR_MSG("Error setting smooth progress bar: %s\n", err.what());