diff --git a/configure.ac b/configure.ac
index 98439946..71b3f4e5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -20,6 +20,17 @@ AC_SUBST(LT_CURRENT, 0)
 AC_SUBST(LT_REVISION, 0)
 AC_SUBST(LT_AGE, 0)
 
+dnl Check for sed -i flag for in-place editing
+case "$host_os" in
+  darwin*)
+    SED_I_BAK="''"
+    ;;
+  *)
+    SED_I_BAK=""
+    ;;
+esac
+AC_SUBST(SED_I_BAK)
+
 AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_SRCDIR([src/a2io.h])
 AC_CONFIG_HEADERS([config.h])
diff --git a/doc/manual-src/ru/Makefile.am b/doc/manual-src/ru/Makefile.am
index cdebe6f3..ddadbc14 100644
--- a/doc/manual-src/ru/Makefile.am
+++ b/doc/manual-src/ru/Makefile.am
@@ -126,7 +126,7 @@ text:
 
 man:
 	$(SPHINXBUILD) -b man $(ALLSPHINXOPTS) $(BUILDDIR)/man
-	sed -i -e '1i .\\" -*- mode: troff; coding: utf-8 -*-' $(BUILDDIR)/man/aria2c.1
+	sed -i $(SED_I_BAK) -e '1i .\\" -*- mode: troff; coding: utf-8 -*-' $(DESTDIR)$(man1dir)/aria2c.1
 	@echo
 	@echo "Build finished. The manual pages are in $(BUILDDIR)/man."