diff --git a/gsl/mlgsl_error.c b/gsl/mlgsl_error.c
index 91e3e0b..6ef15b9 100644
--- a/gsl/mlgsl_error.c
+++ b/gsl/mlgsl_error.c
@@ -43,7 +43,8 @@ void ml_gsl_raise_exn(int gsl_errno)
   exn_arg = alloc_small(2, 0);
   Store_field(exn_arg, 0, Val_int(conv_err_code(gsl_errno)));
   Store_field(exn_arg, 1, copy_string(ml_gsl_exn_msg));
-  CAMLreturn(raise_with_arg(*ml_gsl_exn, exn_arg));
+  raise_with_arg(*ml_gsl_exn, exn_arg);
+  CAMLreturn0;
 }
 
 static void ml_gsl_error_handler(const char *reason, const char *file,