diff --git a/src/Makefile.in b/src/Makefile.in
index 224bd6e03..8bda53446 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -139,7 +139,7 @@ install-includes:
 # We install sudo_noexec by hand so we can avoid a "lib" prefix
 # and a version number.  Since we use LD_PRELOAD, neither is needed.
 install-noexec: install-dirs libsudo_noexec.la
-	if [ -f .libs/lib$(noexecfile) ]; then $(INSTALL) -O $(install_uid) -G $(install_gid) -M 0755 .libs/lib$(noexecfile) $(DESTDIR)$(noexecdir)/$(noexecfile); fi
+	if [ -f .libs/lib$(noexecfile) ]; then $(INSTALL) -b~ -O $(install_uid) -G $(install_gid) -M 0755 .libs/lib$(noexecfile) $(DESTDIR)$(noexecdir)/$(noexecfile); fi
 
 install-plugin: