diff --git a/examples/USER/colvars/peptide.colvars b/examples/USER/colvars/peptide.colvars
index e34f86a7d2..9cf4400521 100644
--- a/examples/USER/colvars/peptide.colvars
+++ b/examples/USER/colvars/peptide.colvars
@@ -33,7 +33,7 @@ harmonic {
   name h_pot
   colvars one two
   centers 10.00 10.0
-  forceConstant 100.0 100.0
+  forceConstant 100.0
 }