diff --git a/_oasis b/_oasis
index 0b7c76981920e0f44746e82b434fe40a2797dd76..aa14cf23214108c0fa3f6ced08d14484e5dd3e58 100644
--- a/_oasis
+++ b/_oasis
@@ -27,8 +27,8 @@ Library libcool
 
   # Warning: we use C++ sources in .c files because oasis does not recognize
   # cpp-files
-  NativeOpt:        -cc g++
-  ByteOpt:        -cc g++
+  NativeOpt:        -cc g++ -unsafe-string
+  ByteOpt:        -cc g++ -unsafe-string
   CCOpt: -std=c++98 -x c++
   # glpk_stub is not included here, because it's not being used by
   # any code right now. Add it back if you need it.