diff --git a/Lib/mzscheme/std_pair.i b/Lib/mzscheme/std_pair.i
index bccd9f0b0..8632d7023 100644
--- a/Lib/mzscheme/std_pair.i
+++ b/Lib/mzscheme/std_pair.i
@@ -6,6 +6,7 @@
 // MzScheme implementation
 
 %include std_common.i
+%include exception.i
 
 
 // ------------------------------------------------------------------------