diff --git a/dune/common/test/fvectortest.cc b/dune/common/test/fvectortest.cc
index 8cc4f795664dbd91044305c834656c22a3bfa817..d7d556d4b6175d60a543ee0d2f19cc35a4e6b494 100644
--- a/dune/common/test/fvectortest.cc
+++ b/dune/common/test/fvectortest.cc
@@ -447,7 +447,7 @@ void checkNormNAN(V const &v, int line) {
   }
 }
 
-// Make sure that a vectors with NaN entries have norm NaN.
+// Make sure that vectors with NaN entries have norm NaN.
 // See also bug flyspray/FS#1147
 template <typename T>
 void