diff --git a/cmake.h.in b/cmake.h.in
index a6d55731d..61a878bca 100644
--- a/cmake.h.in
+++ b/cmake.h.in
@@ -57,5 +57,6 @@ Override PACKAGE_LANGUAGE, then
 #cmakedefine HAVE_UUID
 #cmakedefine HAVE_UUID_UNPARSE_LOWER
 
+/* Undefine this to eliminate the execute command */
 #define HAVE_EXECUTE 1
 
diff --git a/test/rx.t.cpp b/test/rx.t.cpp
index 703ee0fb5..0ed5969e5 100644
--- a/test/rx.t.cpp
+++ b/test/rx.t.cpp
@@ -32,7 +32,7 @@ Context context;
 
 int main (int argc, char** argv)
 {
-  UnitTest ut (15);
+  UnitTest ut (16);
 
   std::string text = "This is a test.";
 
@@ -76,6 +76,10 @@ int main (int argc, char** argv)
   ut.is (start[0],      11, "(e..)[0] == 11->");
   ut.is (end[0],        14, "(e..)[0] == ->14");
 
+  RX r9 ("\\bthe\\b");
+  text = "this is the end.";
+  ut.ok (r9.match (text), text + " =~ /\\bthe\\b/");
+
   return 0;
 }