diff --git a/m4/ax_boost_base.m4 b/m4/ax_boost_base.m4
index b1fed7a50af5..d2d5c2404487 100644
--- a/m4/ax_boost_base.m4
+++ b/m4/ax_boost_base.m4
@@ -10,7 +10,7 @@
 #
 #   Test for the Boost C++ libraries of a particular version (or newer)
 #
-#   If no path to the installed boost library is given the macro searchs
+#   If no path to the installed boost library is given the macro searches
 #   under /usr, /usr/local, /opt, /opt/local and /opt/homebrew and evaluates
 #   the $BOOST_ROOT environment variable. Further documentation is available
 #   at <http://randspringer.de/boost/index.html>.