diff --git a/configure b/configure
index 1be0621d3ef4171955ad0b6eceb7c01f6b673587..e854771d2792c7eaa347a19cf24dc5d4cb1cd60c 100755
--- a/configure
+++ b/configure
@@ -5088,10 +5088,10 @@ if test "$support_cxx11" = false
 then
    { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: C++11 support is required as of PLUMED 2.4" >&5
 $as_echo "$as_me: WARNING: C++11 support is required as of PLUMED 2.4" >&2;}
-   { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: your compiler appears not to support C++11" >&5
-$as_echo "$as_me: WARNING: your compiler appears not to support C++11" >&2;}
-   { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: please change compiler of make sure that everything works correctly" >&5
-$as_echo "$as_me: WARNING: please change compiler of make sure that everything works correctly" >&2;}
+   { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: Your compiler appears not to support C++11" >&5
+$as_echo "$as_me: WARNING: Your compiler appears not to support C++11" >&2;}
+   { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: Please change compiler or make sure that everything works correctly" >&5
+$as_echo "$as_me: WARNING: Please change compiler or make sure that everything works correctly" >&2;}
 fi
 
 
diff --git a/configure.ac b/configure.ac
index 2d6938893020ad5f20af54e17f8141ace3ae2d55..f3d0d3d506cba9b246a7816539b8918ee1d8404d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -296,8 +296,8 @@ this_compiler_does_not_support_cxx11
 if test "$support_cxx11" = false
 then
    AC_MSG_WARN([C++11 support is required as of PLUMED 2.4])
-   AC_MSG_WARN([your compiler appears not to support C++11])
-   AC_MSG_WARN([please change compiler of make sure that everything works correctly])
+   AC_MSG_WARN([Your compiler appears not to support C++11])
+   AC_MSG_WARN([Please change compiler or make sure that everything works correctly])
 fi