diff --git a/Kernel_23/test/Kernel_23/Filtered_cartesian.cpp b/Kernel_23/test/Kernel_23/Filtered_cartesian.cpp
index b47ac7e12e3..6a9c564882d 100644
--- a/Kernel_23/test/Kernel_23/Filtered_cartesian.cpp
+++ b/Kernel_23/test/Kernel_23/Filtered_cartesian.cpp
@@ -15,7 +15,7 @@
 // Author(s)     : Sylvain Pion
 
 // This defines removes the operator/ from CGAL::Mpzf to check that functors not using
-// the tag`FT_necessary` really only need a RT (ring type) without division.
+// the tag `FT_necessary` really only need a RT (ring type) without division.
 #define CGAL_NO_MPZF_DIVISION_OPERATOR 1
 
 #include <CGAL/Cartesian.h>