diff --git a/src/engine/engine.scm b/src/engine/engine.scm
index 4b81587249..2c7e008d68 100644
--- a/src/engine/engine.scm
+++ b/src/engine/engine.scm
@@ -10,11 +10,17 @@
 (export GNC-RND-ROUND-HALF-UP)
 (export GNC-RND-ROUND)
 (export GNC-RND-NEVER)
+(export GNC-DENOM-AUTO)
 (export GNC-DENOM-REDUCE)
 (export GNC-DENOM-FIXED)
 (export GNC-DENOM-LCD)
 (export GNC-DENOM-SIGFIG)
 (export GNC-DENOM-SIGFIGS)
+(export GNC-ERROR-OK)
+(export GNC-ERROR-ARG)
+(export GNC-ERROR-OVERFLOW)
+(export GNC-ERROR-DENOM-DIFF)
+(export GNC-ERROR-REMAINDER)
 (export <gnc-numeric>)
 (export gnc:gnc-numeric?)
 (export gnc:make-gnc-numeric)