diff --git a/flisp.c b/flisp.c
index 87bd2dc..db39958 100644
--- a/flisp.c
+++ b/flisp.c
@@ -2235,6 +2235,7 @@ static void lisp_init(size_t initial_heapsize)
     int i;
 
     llt_init();
+    setlocale(LC_NUMERIC, "C");
 
     heapsize = initial_heapsize;