diff --git a/src/tex2lyx/preamble.cpp b/src/tex2lyx/preamble.cpp
index 5bc92a615e..5b41dd4231 100644
--- a/src/tex2lyx/preamble.cpp
+++ b/src/tex2lyx/preamble.cpp
@@ -120,8 +120,8 @@ string h_paperfontsize           = "default";
 string h_spacing                 = "single";
 string h_papersize               = "default";
 string h_use_geometry            = "false";
-string h_use_amsmath             = "0";
-string h_use_esint               = "0";
+string h_use_amsmath             = "1";
+string h_use_esint               = "1";
 string h_cite_engine             = "basic";
 string h_use_bibtopic            = "false";
 string h_paperorientation        = "portrait";