diff --git a/src/call_stan.cpp b/src/call_stan.cpp
index ee44611..14138d8 100644
--- a/src/call_stan.cpp
+++ b/src/call_stan.cpp
@@ -1,8 +1,13 @@
 #include <Rcpp.h>
 #include <RcppParallel.h>
 #include <cstdint>
+#if defined(EMSCRIPTEN) && !defined(__linux__)
+#define MANUAL_LINUX_DEF 1
+#define __linux__ 1
+#endif
 #include <cmdstan/command.hpp>
 
+
 void store_functions(SEXP ll_fun, SEXP grad_fun);
 
 RcppExport SEXP call_stan_(SEXP options_vector, SEXP ll_fun, SEXP grad_fun) {