diff --git a/bindings/guile/engine.scm b/bindings/guile/engine.scm
index 76be35339a..2997189cb8 100644
--- a/bindings/guile/engine.scm
+++ b/bindings/guile/engine.scm
@@ -37,8 +37,8 @@
 (export account-full-name<?)
 (export accounts-get-children-depth)
 
-(define-public GNC_COMMODITY_NS_CURRENCY "CURRENCY")
-(define-public GNC_COMMODITY_NS_NONCURRENCY (gettext "ALL NON-CURRENCY"))
+(define-public GNC-COMMODITY-NS-CURRENCY "CURRENCY")
+(define-public GNC-COMMODITY-NS-NONCURRENCY (gettext "ALL NON-CURRENCY"))
 
 (define (gnc-pricedb-lookup-latest-before-t64 . args)
   (issue-deprecation-warning "gnc-pricedb-lookup-latest-before-t64 has been renamed to gnc-pricedb-lookup-nearest-before-t64")