diff --git a/configure b/configure
index 977eee3b90..6bfafd7d5e 100755
--- a/configure
+++ b/configure
@@ -18505,7 +18505,7 @@ $as_echo "#define HAVE_CXX17 1" >>confdefs.h
             ;;
 
         *)
-            as_fn_error $? "Invalid --with-cxx=\"$wxWITH_CXX\" option value, only 11, 14 or 17 supported" "$LINENO" 5
+            as_fn_error $? "Invalid --with-cxx=$wxWITH_CXX option value, only 11, 14 or 17 supported" "$LINENO" 5
     esac
 
     if test "$HAVE_CXX11" = "1" ; then
diff --git a/configure.in b/configure.in
index 5be318d8dd..4a858dbe9d 100644
--- a/configure.in
+++ b/configure.in
@@ -1139,7 +1139,7 @@ if test -n "$wxWITH_CXX"; then
             ;;
 
         *)
-            AC_MSG_ERROR([Invalid --with-cxx="$wxWITH_CXX" option value, only 11, 14 or 17 supported])
+            AC_MSG_ERROR([Invalid --with-cxx=$wxWITH_CXX option value, only 11, 14 or 17 supported])
     esac
 
     if test "$HAVE_CXX11" = "1" ; then