diff --git a/ice-9/emacs.scm b/ice-9/emacs.scm
index eb53e3aed..7dc0ebd65 100644
--- a/ice-9/emacs.scm
+++ b/ice-9/emacs.scm
@@ -32,7 +32,8 @@
 (define-module (ice-9 emacs)
   :use-module (ice-9 debug)
   :use-module (ice-9 threads)
-  :use-module (ice-9 session))
+  :use-module (ice-9 session)
+  :no-backtrace)
 
 (define emacs-escape-character #\sub)
 
diff --git a/ice-9/slib.scm b/ice-9/slib.scm
index 3b00f8549..d03ae86d3 100644
--- a/ice-9/slib.scm
+++ b/ice-9/slib.scm
@@ -19,7 +19,8 @@
 ;;;;   to the Free Software Foundation, Inc., 59 Temple Place, Suite
 ;;;;   330, Boston, MA 02111-1307 USA
 ;;;;
-(define-module (ice-9 slib))
+(define-module (ice-9 slib)
+  :no-backtrace)