diff --git a/Makefile.am b/Makefile.am
index 5f9e0116..5f622acb 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -247,7 +247,7 @@ install-exec-hook:
 		sed -e "s|@SYSCONFDIR@|$(sysconfdir)|g" $(srcdir)/tmux.1| \
 			$(AWK) -f$(srcdir)/mdoc2man.awk >$(srcdir)/tmux.1.man; \
 	fi
-	$(MKDIR_P) $(DESTDIR)$(mandir)/man1
+	$(mkdir_p) $(DESTDIR)$(mandir)/man1
 	$(INSTALL_DATA) $(srcdir)/tmux.1.@MANFORMAT@ \
 		$(DESTDIR)$(mandir)/man1/tmux.1
 
diff --git a/configure.ac b/configure.ac
index 7cc1ac5d..a81ecc42 100644
--- a/configure.ac
+++ b/configure.ac
@@ -16,7 +16,6 @@ AC_CANONICAL_HOST
 # Set up the compiler in two different ways and say yes we may want to install.
 AC_PROG_CC
 AM_PROG_CC_C_O
-AC_PROG_MKDIR_P
 AC_PROG_INSTALL
 
 # Default tmux.conf goes in /etc not ${prefix}/etc.